It is possible to quickly move or re-assign a job from one pet sitter to another from within the admin diary.
Select DIARY & SCHEDULE from the main menu and navigate to the required day.
Click the required service in the diary.
Screen Shot - Admin Diary - Select a service to re-assign
On the next screen, use the staff drop down to re-assign the job to the required pet sitter.
Screen Shot - Re-assign job from one pet sitter to another.
The diary now reflects the changes made.
Screen Shot - The service successfully re-assigned.