To automatically dispatch appointments booked online to the available personnel instead of asking your client to choose a personnel or doing the dispatch manually yourself, follow these steps:
Go to the profile of the service you would like to dispatch appointment automatically
Click on Booking Rules
Select “No Personnel Selection” under Online Personnel Selection
Set the Time Selection Mode on “Display time slot with automatic dispatch” or “Display time slot with automatic dispatch (resource)”
Click Save, and you're done.
Notes : The Automatic dispatch option will automatically assign the appointment to the staff, who is available at the requested time and has the least amount of bookings on that day.