do it in use case diagram

Appointment scheduling by an administrative staff The below given is a scenario shows the process of patient appointment scheduling by an administrative staff. The staff login to the system, the system validates the credentials. The staff selects appointment page and select an appointment date. Add the patient ID and send for an appointment to the system. The system verifies the date and accepts or reject based on the availability of the booking slot on that particular date. If the booking is available, the database will be updated and send confirmation message to the staff, or sends an error message