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What is Call Booking?

With Call Booking, your AI agent can automatically schedule appointments in your Cal.com calendar while talking with customers. Example:
  • Customer: “I’d like to book an appointment for Tuesday at 2 PM”
  • AI collects their name and email
  • AI creates the booking in your calendar
  • Customer gets a confirmation email
  • Done! No manual scheduling needed.

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🎮 Interactive Demo

Watch how to set up appointment booking:
  • Simple Agents
  • Workflow Agents

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🛠 Step-by-Step Instructions

  • Simple Agents
  • Workflow Agents

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Step 1: Get Your Cal.com Details

Before you start, you’ll need a Cal.com account.What you’ll need:
  • Your Cal.com username (e.g., if your link is cal.com/john, your username is john)
  • Or your organization slug (e.g., if your team URL is acme.cal.com, it’s acme)
Don’t have Cal.com yet? Sign up for free at cal.com
First time using Cal.com? Make sure you’ve created at least one event type in your calendar. Go to Event Types and create one (like “30 Minute Meeting”) before continuing.

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Step 2: Go to Simple Agents

  1. Open your OpenMic dashboard
  2. Click Simple Agents in the sidebar
  3. Select your agent

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Step 3: Open Custom Functions Tab

Click the Custom Functions tab at the top.

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Step 4: Add Call Booking Function

  1. Click Add Function
  2. Select Call Booking from the list
Choose Call Booking Function

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Step 5: Choose Static Mode (Easy Setup)

When the configuration popup appears:
  1. Select Static Mode (no API key needed!)
  2. Enter your Cal.com username or organization slug
  3. Click Fetch Event Types

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Step 6: Select Your Event Type

You’ll see a dropdown with your calendar types (like “30 Min Meeting”, “Consultation”, etc.)Choose the event type you want to book.What’s an event type?
It’s the type of appointment in your Cal.com calendar - like a 30-minute call, 1-hour consultation, etc.Click Next to continue.

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Step 7: Configure the Function

Fill in these fields:Function Name: book_appointment
(Use underscores, no spaces)Description: Use this when the customer wants to book an appointmentTimezone (optional): Your timezone like America/New_York

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Step 8: Save the Function

Click Create Function at the bottom.

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Step 9: Update Your Agent Prompt

Tell your AI when to use the booking function:
  1. Go to the Configuration tab
  2. Add this to your agent’s prompt:
When a customer confirms they want to book an appointment and provides 
their preferred time, use the book_appointment function. Make sure to 
collect their name and email address first.

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Step 10: Test It!

  1. Call your AI agent
  2. Say: “I’d like to book an appointment for Tuesday at 2 PM”
  3. AI will ask for your name and email
  4. AI creates the booking
  5. You get a confirmation email!
Example conversation:
Customer: "I'd like to book for Tuesday at 2 PM"
AI: "Perfect! May I have your name and email?"
Customer: "John Smith, john@example.com"
AI: "Great! I've booked your appointment for Tuesday at 2:00 PM. 
You'll receive a confirmation email shortly!"
Use your own email first to see how the booking confirmation works!

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💡 Pro Tip

Combine with Calendar Check: Add the Check Calendar Availability function to your agent too! This way, when customers ask “When are you available?”, your AI can show them open time slots. Then once they pick a time, it uses the booking function to confirm it. This gives a much better experience and avoids double-booking.

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💡 Quick Reminder

Static mode uses public event types. Make sure your event type is set to “Public” in your Cal.com settings.

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What’s Next?

Now that you have basic booking set up, you can:
  • Add availability checking so customers see open slots first
  • Use Webhook Mode for private calendars (requires API key)
  • Create multiple booking nodes for different appointment types

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Need More?

Full Call Booking Documentation

Explore advanced features like webhook mode, API configuration, and booking for Simple Agents.