Hey Miranda 
If you use the members page with bookings you can do the following:
Quickly re-book a new session without re-entering their details
Cancel an upcoming booking
Reschedule an upcoming booking (if the service is not part of a membership plan )
Check the time, location, and payment details of a past or upcoming booking
In terms of editing other details, that sounds like a great #FeatureRequest for #WixBookings.