List the name of physicians who never took any appointment.
SELECT name FROM physician EXCEPT SELECT T2.name FROM appointment AS T1 JOIN physician AS T2 ON T1.Physician  =  T2.EmployeeID
SELECT name FROM physician EXCEPT SELECT T2.name FROM appointment AS T1 JOIN physician AS T2 ON T1.Physician  =  T2.EmployeeID
[{'Name': 'Bob Kelso'}, {'Name': 'John Wen'}, {'Name': 'Keith Dudemeister'}, {'Name': 'Todd Quinlan'}]