Is the workflow free to use?

The n8n workflow itself is free, but you pay for OpenAI usage, Cal.com, and the SMS provider (seven/sms77).

What do I need before importing?

API keys for OpenAI, Cal.com, Google Sheets OAuth, a WhatsApp webhook provider, and seven/sms77 SMS credentials.

How do I import this into n8n?

Download the JSON from the workflow page and import it via the n8n editor’s import function.

Automate WhatsApp Booking System with GPT-4 Assistant, Cal.com and SMS Reminders

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Automates WhatsApp bookings via AI, Cal.com scheduling, Google Sheets, and SMS reminders.

n8nAI & LLMIntermediate👁 4.7K views

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Updated 2026-06-16

What this workflow does

The automation handles inbound WhatsApp messages with an AI Agent, books appointments in Cal.com, logs data to Google Sheets, and dispatches timed SMS reminders via seven.

It is designed for solo entrepreneurs, consultants, coaches, and clinics that need to automate client scheduling without manual intervention.

Who is this for?

Solo entrepreneurs, consultants, coaches, and small clinics that manage client appointments via WhatsApp and want to remove manual scheduling work.

What problem it solves

Manually replying to WhatsApp messages, checking calendars, booking slots, and sending reminders consumes hours each week and risks missed leads or no-shows.

Live workflow preview

Interactive canvas of every node and connection — scroll and click to explore. Powered by n8n's preview.

Open the template on n8n to import and run it. View source template →

What it automates

Solo coach intake

A fitness coach receives a WhatsApp inquiry, the AI collects details, books a slot in Cal.com, and stores the record in Google Sheets without any manual steps.

Clinic appointment flow

A small clinic lets patients message on WhatsApp; GPT-4 qualifies the request, suggests times, books via Cal.com, and triggers an SMS reminder two hours before the visit.

Consultant follow-up

A business consultant uses the workflow to qualify prospects overnight, book discovery calls, and log every booking in Google Sheets for later review.

How the workflow works

The 8 nodes in this automation, in order.

1Google SheetsgoogleSheets
2HTTP RequesthttpRequest
3sevensms77
4Codecode
5AI Agent@n8n/n8n-nodes-langchain.agent
6OpenAI Chat Model@n8n/n8n-nodes-langchain.lmChatOpenAi
7Simple Memory@n8n/n8n-nodes-langchain.memoryBufferWindow
8HTTP Request Tool@n8n/n8n-nodes-langchain.toolHttpRequest

Apps & integrations used

Google SheetsHTTP RequestsevenAI AgentOpenAI Chat ModelSimple MemoryHTTP Request Tool

How to set up Automate WhatsApp Booking System with GPT-4 Assistant, Cal.com and SMS Reminders

1Connect the Webhook node to your WhatsApp provider (360dialog, Twilio or Ultramsg).
2Add your OpenAI API key to the OpenAI Chat Model node.
3Configure the HTTP Request nodes with your Cal.com API key and calendar ID.
4Link the Google Sheets node and map fields: name, email, date, time, status, reminder_sent.
5Set up the seven / sms77 credentials in the SMS nodes for reminders.
6Activate the schedule trigger that scans for upcoming appointments.

How to customize this workflow

→Edit the system prompt inside the AI Agent node to change language or tone.
→Swap the OpenAI Chat Model for another supported model via the same node.
→Add an extra HTTP Request Tool call to filter Cal.com slots by service type.
→Change the reminder schedule node interval or add a second reminder 24 h before.