Handle voice-based appointment bookings with OpenAI, Cal.com and WhatsApp

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1. Workflow Overview

Best for

Support Chatbot automation workflows
AI Chatbot automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.stickynote, n8n-nodes-base.webhook, n8n-nodes-base.set, n8n-nodes-base.httprequest, n8n-nodes-base.code, n8n-nodes-base.filter, n8n-nodes-base.if, n8n-nodes-base.respondtowebhook

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Oneclick AI Squad.

Original n8n.io source

1.1 Workflow description

Title: Handle voice-based appointment bookings with OpenAI, Cal.com and WhatsApp
Workflow name: Handle voice-based appointment bookings with OpenAI, Cal.com and WhatsApp

This workflow handles incoming voice calls or audio messages, transcribes them using Whisper (OpenAI) or ElevenLabs, extracts booking intent and preferred time slots using AI, checks availability on Cal.com or Google Calendar, books the appointment automatically, and sends a confirmation via WhatsApp, SMS, or Email.

Who's it for

• Service businesses (clinics, salons, consultants, coaches) • Solopreneurs who want a 24/7 voice booking assistant • Teams that receive appointment requests via phone/WhatsApp voice notes

How it works / What it does

Receives incoming voice call or audio file via Webhook
Transcribes audio using OpenAI Whisper or ElevenLabs STT
AI extracts booking intent: name, date, time, service type
Validates and normalizes extracted date/time
Checks real-time availability on Cal.com or Google Calendar
If slot is free → books the appointment automatically
If slot is taken → AI suggests next 3 available slots
Generates a voice or text confirmation response
Sends confirmation via WhatsApp, SMS, or Email
Logs all bookings to Google Sheets

How to set up

Import this workflow into n8n
Configure credentials: OpenAI (Whisper), Cal.com API, Google Calendar, Twilio, SendGrid
Update your business name, services list, and timezone
Point your phone/WhatsApp webhook to the n8n webhook URL
Activate workflow

Requirements

• OpenAI API key (Whisper STT + GPT for intent extraction) • Cal.com API key OR Google Calendar OAuth • Twilio account (WhatsApp / SMS confirmation) • SendGrid (email confirmation, optional) • Google Sheets (booking log)

How to customize

• Swap Whisper with ElevenLabs STT in the transcription node • Add service-specific booking rules in the AI Extraction node • Change confirmation channel in the Set Preferences node • Extend slot suggestion logic in the JS Availability node

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Sticky Note - Overview

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 2 - Sticky Note - Section 1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 3 - Sticky Note - Section 2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 4 - Sticky Note - Section 3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 5 - Sticky Note - Section 4

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 6 - Webhook - Incoming Voice or Audio

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 1.1

Block 7 - Set Business Config

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 8 - Whisper STT - Transcribe Audio

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 9 - ElevenLabs STT - Alt Transcription

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 10 - JS - Merge Transcription Result

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 11 - AI - Extract Booking Intent

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 12 - JS - Parse Extracted Intent

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 13 - Filter - Is Booking Request?

Type / Role: n8n-nodes-base.filter - filter
Config choices: Version 2.2

Block 14 - Cal.com - Check Available Slots

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 15 - Google Calendar - Check Busy Times

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 16 - JS - Evaluate Slot Availability

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 17 - Route - Slot Available or Conflict?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 18 - Cal.com - Book the Appointment

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 19 - AI - Generate Conflict Response

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 20 - JS - Build Confirmation Message

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 21 - Route - WhatsApp or Email?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 22 - Send WhatsApp Confirmation

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 23 - Send Email Confirmation

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 24 - Webhook Response

Type / Role: n8n-nodes-base.respondToWebhook - respondToWebhook
Config choices: Version 1.1

Showing the first 24 of 27 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Handle voice-based appointment bookings with OpenAI, Cal.com and WhatsApp
Complexity	advanced
Nodes	27
Categories	Support Chatbot, AI Chatbot
Author	Oneclick AI Squad
Published	17 Apr 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/15117/15117.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Support Chatbot workflows AI Chatbot workflows

Frequently asked questions

What does Handle voice-based appointment bookings with OpenAI, Cal.com and WhatsApp do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Support Chatbot, AI Chatbot use case.

Oneclick AI Squad

224 workflows

Nodes

n8n-nodes-base.stickynote n8n-nodes-base.webhook n8n-nodes-base.set n8n-nodes-base.httprequest n8n-nodes-base.code n8n-nodes-base.filter n8n-nodes-base.if n8n-nodes-base.respondtowebhook

Complexity

advanced

Published 17 Apr 2026

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/15117/15117.json

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Handle voice-based appointment bookings with OpenAI, Cal.com and WhatsApp

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Who's it for

How it works / What it does

How to set up

Requirements

How to customize

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Sticky Note - Overview

Block 2 - Sticky Note - Section 1

Block 3 - Sticky Note - Section 2

Block 4 - Sticky Note - Section 3

Block 5 - Sticky Note - Section 4

Block 6 - Webhook - Incoming Voice or Audio

Block 7 - Set Business Config

Block 8 - Whisper STT - Transcribe Audio

Block 9 - ElevenLabs STT - Alt Transcription

Block 10 - JS - Merge Transcription Result

Block 11 - AI - Extract Booking Intent

Block 12 - JS - Parse Extracted Intent

Block 13 - Filter - Is Booking Request?

Block 14 - Cal.com - Check Available Slots

Block 15 - Google Calendar - Check Busy Times

Block 16 - JS - Evaluate Slot Availability

Block 17 - Route - Slot Available or Conflict?

Block 18 - Cal.com - Book the Appointment

Block 19 - AI - Generate Conflict Response

Block 20 - JS - Build Confirmation Message

Block 21 - Route - WhatsApp or Email?

Block 22 - Send WhatsApp Confirmation

Block 23 - Send Email Confirmation

Block 24 - Webhook Response

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions