Predict no-show risk and route reminders with Google Calendar, Sheets, Slack and OpenAI

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1. Workflow Overview

Who is this for Business owners and service providers who want to reduce no show rates for appointments booked via Google Calendar. What this workflow does This workflow fetches tomorrow's Google C...

Best for

Ticket Management automation workflows
AI Summarization automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.stickynote, n8n-nodes-base.scheduletrigger, n8n-nodes-base.set, n8n-nodes-base.googlecalendar, n8n-nodes-base.googlesheets, n8n-nodes-base.code, n8n-nodes-base.switch, @n8n/n8n-nodes-langchain.openai

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Ayaka Sato.

Original n8n.io source

1.1 Workflow description

Title: Predict no-show risk and route reminders with Google Calendar, Sheets, Slack and OpenAI
Workflow name: Predict no-show risk and route reminders with Google Calendar, Sheets, Slack and OpenAI

Who is this for

Business owners and service providers who want to reduce no-show rates for appointments booked via Google Calendar.

What this workflow does

This workflow fetches tomorrow's Google Calendar bookings, looks up each customer's no-show history from Google Sheets, and calculates a risk score (0-100) from four weighted signals. Based on the score, it routes to three automated responses: a Slack alert plus AI re-confirmation email for super high risk, a friendly AI reminder email for high risk, and a silent log for low risk.

Setup

Create a Google Sheets file with a tab named customer_history (columns: customer_email, customer_name, total_bookings, no_show_count, last_booking_date, last_status)
Open the Set Configuration node and fill in your Sheet ID and Slack channel
Connect Google Calendar, Google Sheets, Gmail, Slack, and OpenAI credentials
Activate the workflow

Requirements

Google Calendar with appointment bookings
Google Sheets for customer history
Slack workspace for alerts
OpenAI API key (used only for generating email text)
Gmail account with OAuth2 access

How to customize

Adjust the risk thresholds in Set Configuration (default: 70 for Super High, 40 for High)
Edit the AI prompts in Generate Urgent Message and Generate Reminder nodes to match your tone
Replace Slack with Discord webhook if preferred

Important note

Risk scoring is 100% rule-based. AI is used only for generating reminder text, never for the risk judgment itself.

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 - README

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

Block 2 - Trigger & Configuration

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

Block 3 - Data Collection

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

Block 4 - Risk Assessment

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

Block 5 - Risk Routing

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

Block 6 - Super High Response

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

Block 7 - High Response

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

Block 8 - Low Response

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

Block 9 - Daily at 9 AM

Type / Role: n8n-nodes-base.scheduleTrigger - scheduleTrigger
Config choices: Version 1.3

Block 10 - Set Configuration

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

Block 11 - Get Tomorrow's Bookings

Type / Role: n8n-nodes-base.googleCalendar - googleCalendar
Config choices: Version 1.3

Block 12 - Extract Customer Info

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

Block 13 - Lookup Customer History

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.7

Block 14 - Calculate Risk Score

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

Block 15 - Route by Risk Level

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

Block 16 - Generate Urgent Message

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 2.1

Block 17 - Send Slack Alert

Type / Role: n8n-nodes-base.slack - slack
Config choices: Version 2.4

Block 18 - Send Re-confirmation Email

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

Block 19 - Generate Reminder

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 2.1

Block 20 - Send Reminder Email

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

Block 21 - Log Low-Risk Booking

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.7

Block 22 - Sticky Note

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

3. Summary Table

Workflow	Predict no-show risk and route reminders with Google Calendar, Sheets, Slack and OpenAI
Complexity	advanced
Nodes	22
Categories	Ticket Management, AI Summarization
Author	Ayaka Sato
Published	17 Apr 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/15108/15108.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 Ticket Management workflows AI Summarization workflows

Frequently asked questions

What does Predict no-show risk and route reminders with Google Calendar, Sheets, Slack and OpenAI 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 Ticket Management, AI Summarization use case.

Ayaka Sato

3 workflows

Nodes

n8n-nodes-base.stickynote n8n-nodes-base.scheduletrigger n8n-nodes-base.set n8n-nodes-base.googlecalendar n8n-nodes-base.googlesheets n8n-nodes-base.code n8n-nodes-base.switch @n8n/n8n-nodes-langchain.openai

Complexity

advanced

Published 17 Apr 2026

Likes 0

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Install path: /data/workflows/15108/15108.json

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Predict no-show risk and route reminders with Google Calendar, Sheets, Slack and OpenAI

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Who is this for

What this workflow does

Setup

Requirements

How to customize

Important note

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - README

Block 2 - Trigger & Configuration

Block 3 - Data Collection

Block 4 - Risk Assessment

Block 5 - Risk Routing

Block 6 - Super High Response

Block 7 - High Response

Block 8 - Low Response

Block 9 - Daily at 9 AM

Block 10 - Set Configuration

Block 11 - Get Tomorrow's Bookings

Block 12 - Extract Customer Info

Block 13 - Lookup Customer History

Block 14 - Calculate Risk Score

Block 15 - Route by Risk Level

Block 16 - Generate Urgent Message

Block 17 - Send Slack Alert

Block 18 - Send Re-confirmation Email

Block 19 - Generate Reminder

Block 20 - Send Reminder Email

Block 21 - Log Low-Risk Booking

Block 22 - Sticky Note

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