A hospital plans to build a healthcare system, which managespatient information. A hospital has a CEO, doctors, nurses andstaff. A patient can make an appointment, change, or cancel theappointment by calling a staff in the hospital. When a patientmakes an appointment, she/he tells a doctor name to a staff whochecks if the doctor is available from 9 am to 5 pm on a halfhourly basis. The appointment is recorded in the system, and it isupdated whenever the patient changes or cancels the appointment.Each appointment will be cleared after a patient visits a doctor inthe hospital. In case of no-show appointments,
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