Appointment Booking Plugin

Hi everyone, what plugin do you recommend for having an Appointment Booking on the website?

here’s what i wanted it to work:
I have a page on my that displays a calendar and then the user will select a date and after selecting they will be asked what time ( basically the time schedule is blocked/unavailable whenever someone already booked into ) and select also what kind of appointment ( each appointment has it’s own pricing).
After selecting the time and appointment, they will be asked with their Name, Email and message then when submit they will pay through paypal.

basically, that’s it. just a notification/confirmation upon completing the booking.

i’m hoping for a free one if there is.

Thanks!