Hello @user1950 and welcome to Elfsight Community 
Unfortunately, we don’t have such an app at the moment, but we do have plans to present it in the future.
Our devs are working on this app, however, due to the heavy workload, this is not the priority task now. So, unfortunately, we cannot name the exact release dates for this app. Please accept my sincere apologies!
Please vote for this app to get a notification upon its release here - Appointment Booking
If you have any ideas regarding the widget’s functionality, please feel free to share it with us 