TidyCal

I had the problem of scheduling my agenda for customers, and it was a really nightmare to attend the calls and customers in my shop.
I was messing around with different options, and the best one is Tidycall. Easy to configure, updates immediately my google calendar after a booking or a cancellation and it has a single and affordable payment instead of monthly fees as other options.
By the other hand the team of tidycall is always improving the software with better performances, and in cas you have any problem, they are ready to help and solve the trouble.
It is a great software.