Overnight sitter only stays 3 of the 6 nights. Owner is out of the country. What happens for the 3 nights the sitter did not complete the job?
If the sitter did not perform the services and dates confirmed in the booking I would call Rover Support @ [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]. If a new sitter is required the support team will assist in trying to find a replacement, with no guarantees.