I can't do a booking — how do I cancel it?

From the booking. In provider mode, open the booking → "Can't make it? Cancel booking" → pick a reason (add a note) → confirm. The owner is refunded in full automatically and told in the chat.

Better: block the time first. Cancellations count against your profile. Business profile → Availability → "Calendar & time off" lets you block hours or days before anyone books them.

A request you haven't accepted. Just decline it — the owner's hold is released and nothing counts against you.