To remove a service provider from a booking, go to the "Dispatcher" section
1. Drag the booking back to the Unassigned row

2. Then drag it to the service provider(s) that you would like to assign it to.

When you save and notify, only the assignments that have changed will be shown in the prompt.

Related Resources
How can I assign a service provider to a booking?
How can I send my service provider their upcoming schedule via email?