Appointment Booking and Confirmation

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@client.on(events.INCOMING_CALL)
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async def appointment_booking(call: ActiveCall):
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    await call.answer()
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    customer = await db.get_customer_by_phone(call.caller_number)
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    existing_appointments = await calendar.get_upcoming(customer.id) if customer else []
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    if existing_appointments:
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        next_appt = existing_appointments[0]
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        msg = (
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            f"Hi {customer.name}, I see you have an appointment on "
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            f"{next_appt.date}. Would you like to reschedule or book a new one?"
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        )
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        await call.send_audio(await tts.synthesize(msg))
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    else:
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        await call.send_audio(
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            await tts.synthesize("Hi! I can help you book an appointment.")
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        )
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    # AI conversational loop to gather appointment details
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    appointment_details = await ai_model.gather_appointment_info(call)
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    # Check availability
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    available_slots = await calendar.get_available_slots(
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        date=appointment_details["date"],
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        service=appointment_details["service"],
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    )
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    if available_slots:
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        # Book the appointment
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        booking = await calendar.create_booking(
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            customer_id=customer.id,
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            slot=available_slots[0],
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            service=appointment_details["service"],
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        )
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        await call.send_audio(
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            await tts.synthesize(
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                f"You're booked for {booking.date} at {booking.time}. "
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                "You'll receive a confirmation SMS shortly."
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            )
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        )
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        await sms.send_confirmation(call.caller_number, booking)
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    else:
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        await call.send_audio(
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            await tts.synthesize(
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                "Unfortunately there are no slots available on that date. "
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                "Let me connect you with our scheduling team."
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            )
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        )
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        # Connect to the original callee and leave
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        await call.connect()
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        await call.close()
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        return
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    await call.disconnect()