The tool gets a list of open appointment times from a scheduling system, and shows the available times in a way that's easy to understand. After this asks to pick the time that works best for user, and  Once you've chosen a time, it confirms your appointment.

Initially, call the function without any arguments.
The function will show you the available appointment times.
Ask the user to review the available times, and When user find one user like, call this function again, this time providing two things:
selectedSlot: The specific time user chose.
mobileNumber: User mobile number.

Then If user appointment is successfully booked, the function will return a confirmation message. If there's a problem (like the slot is no longer available), it will let you know.