How to create a beauty salon form?

como eu posso criar um formulário para salão de beleza onde cliente seleciona um horário e esse horário fica indisponível para outra pessoa acessar

Unfortunately, we do not have a widget with that specific functionalities.

We currently have two (2) widgets with a bit similar functionality which is reservation but they're lacking most of the functionalities you've mentioned. If you like, you may consider using any of these.

1.) Date Reservation widget, limits 1 selection per day. Multiple dates selection is possible. 

2.) Quantity Gift Registry, not a calendar but you can define dates as list options then add no. of quantity limits.

Guide: How-to-Add-a-Widget-to-Your-Form

It will help us provide you with the appropriate workaround/suggestions if you can elaborate further on what you wanted to do using the form.