If you have accidentally deleted an Operator there's no need to fret! This can easily be reversed by undeleting your Operator:
Go to Admin > Operators > Show Deleted:
A list of all deleted operators will appear. Select Undelete next to the deleted operator:
NOTE: If you have multiple deleted operators with the same name, make sure you are undeleting the correct operator. Appointments will not appear back on the Appointments Page until the correct Operator has been undeleted.