UserScheduling ClientScheduling ServerScheduling ServerScheduling ServerScheduling ServerScheduling ServerUserScheduling ClientScheduling ServerUserUserScheduling ClientScheduling ClientScheduling ServerScheduling ServerUserScheduling ClientScheduling ServerScheduling ServerScheduling ServerScheduling ServerScheduling ServerOpen clientGet available HealthcareServicesAvailable HealthcareServicesSelect HealthcareServiceGet available SchedulesAvailable SchedulesGet available SlotsAvailable SlotsSelect slotopt[holding appointment]Reserve slotReserve slot responseBook appointmentBook appointment responseConfirm appointment booking