Doctor Hendra, the only dentist in town, has a computer system that can help him make appointments for patients and dental treatment for patients. Receptionist Doctor Hendra will make appointments with patients when they call or when they are back in the waiting room after treatment. Sometimes patients also call to cancel appointments or change them. Doctor Hendra keeps a note on the system about his patient care which is updated every time he sees a patient. Then the receptionist Doctor Hendra also made a payment bill for the patient and made a payment record in the system. Make a Use Diagram of the case

NOTE: actor -> doctor, receptionist, patient