Voice-based appointment booking system with ElevenLabs AI and Cal.com

What problem does this workflow solve? Tired of the back-and-forth involved in scheduling meetings? This workflow lets you offer a seamless, voice-based appointment booking experience. It automatically checks your Cal.com availability and either books a meeting or helps the caller choose another time—powered by ElevenLabs for a human-like voice interaction. --- ⚙️ What does this workflow do? 1. Receives an inbound voice call (e.g., from a website or IVR system). 2. Uses ElevenLabs to drive the voice interaction with natural, AI-generated speech. 3. Checks real-time availability from your Cal.com calendar. 4. Books a meeting if a slot is available. 5. If not, asks the user to suggest a new time and checks availability again. 6. Confirms the appointment with a verbal response and optional email or SMS. --- 🔧 Setup 🧠 ElevenLabs Custom Tools Setup Add two tools in Custom Tools in ElevenLabs with the following details. 1. Name: bookSlot Description: Use this tool when the user confirms their slot and appointment. When you have the proper name and email of theirs. POST: {n8nwebhookurl} 2. Name: checkAvailableSlot Description: Use this slot to check Available slots in our calendar. POST: {n8nwebhookurl} 🗣 ElevenLabs Prompt Configuration First Message: Thanks for calling InfyOm Technologies. How can I help you? Use the following System Prompt: 📅 Cal.com API Setup - Go to cal.com and generate an API Key. - Create new Cal API credentials in n8n. - Set this API Key in the credentials. --- 🧠 How it Works ☎️ 1. Incoming Call An inbound call is received by the system, and the user begins the conversation with your voice AI agent. 🧏 2. Voice Interaction via ElevenLabs The caller is greeted and asked for their preferred appointment time. All conversations are powered by natural AI speech from ElevenLabs. 🗓 3. Availability Check (Cal.com) The requested time is validated against your Cal.com availability: - ✅ If available, the appointment is booked instantly. - ❌ If unavailable, the agent informs the caller and asks for another time. 🔁 4. Retry Loop (If Slot Unavailable) If the initial slot is unavailable: - The agent asks for a new preferred time. - The process repeats until a valid slot is found or a fallback message is delivered. ✅ 5. Appointment Confirmation Once booked, the AI confirms the appointment verbally. You may also configure it to send: - 📧 Email confirmations - 📱 SMS reminders (optional) --- 👤 Who can use it? This is perfect for: - 🧑‍⚕️ Clinics or Therapists - 🧑‍💼 Consultants & Coaches - 🏢 Sales Teams - 🧠 AI-first SaaS Tools If your business relies on scheduled meetings and you'd like to automate bookings using a conversational voice experience, this is your go-to no-code solution. ---