Use Case Diagram for Patient management system

ABC hospital has a patient management system. A patient must register with the hospital before start of the treatment. Once registered, a doctor is assigned to the patient. The patient must be provided with an appointment date based on the urgency. A doctor meets the patient and request tests to be performed by labs. When the lab results are ready, a new appointment is set with doctor. Doctor meets the patient again and prescribe medicines and treatments$/$rehabilitation$.$