TidyCal

I have purchased at least 5 Booking products from AppSumo and only a couple have worked out well for me.

TidyCal has been a good simple to use calendar for my clients. It has the basic features needed without all the extra bells and whistles that may or may not cause extra problems when the software fails. It sends out reminders, allows me to change schedules easily, and even allows me to charge for a booking session.

Give TidyCal a try and see for yourself that it will do any basic booking project you need.