How do I edit the request from House Sitting (Overnight) to Dog Walk (Daily) before booking?

Changing services for a booking cannot be done by a sitter. There are two ways to handle the change, 1 you can call Rover support for their assistance [Edit: Rover’s contact options have changed. Visit the Rover Help Center at https://support.rover.com/ to find the phone number, help articles, or chat with the team] or 2 you can ask the client to create a new booking for the correct service.