Why does the annual general health show that you can't cancel your appointment at this time?

The annual big health show that the reason why the appointment can't be cancelled at this time period is the change of system. According to the relevant information, the appointment for the physical examination of the University of America cannot be changed after success, and the appointment can only be cancelled. If the online appointment registration time conflicts, the appointment will be cancelled before 15: 00 the day before at the latest. If you cancel there, you can make an appointment directly, without permission.