We use the calendar in a doctor's clinic. For example, for a service, for example, a cardiologist. The user receives a reservation at 11:00 am. We turn it off for 1 hour. It takes 1 hour, that is, until 12:00. But for the same doctor, an ophthalmologist service is also attached, as is the heart. The user can choose the ophthalmologist service and make an appointment on the same day, at the same time, at 11:00. In this condition, he gives 2 appointments at the same time. How can we avoid this conflict? We have many services. We have to make arrangements for each one separately, which increases our workload. Can we close the doctor's clock directly, not the service?