Using elementary java programming

A private dental practice wishes to computerize its patient records system. A patient must register with the practice and the system needs to store their name, address and mobile telephone number. Each patient is given a unique seven-digit patient number. The system will keep a count of how many patients the practice currently has. Patients can book an appointment with a particular dentist; the system needs to store the date of the appointment and if the patient attended. A text message will be automatically sent out two working days before the appointment. After the appointment, the dentist updates the system with the cost of the treatment undertaken. i. Identify any TWO (2) appropriate classes based on above scenario. ii. Identify any TWO (2) instance variables for each of classes that been identified in iii. Identify any TWO (2) instance methods for each of classes that been identified in