1. Refresh the page: There may be a problem with the system cache, so the previous reservation information is still in the system, and it is impossible to make a new reservation. You can try to refresh the page or clear the browser cache, and then re-enter Tongji reservation system to make an appointment.
2. Modify the reservation information: If the previous reservation information is the same as the re-reservation information, it may also cause the re-reservation to be impossible. You can try to modify the reservation information, such as the reservation time and place, and then make a reservation again.
3. Consult the hospital outpatient department: If the above two methods still can't solve the problem, you can consult the tongji hospital outpatient department and seek the help of the hospital staff to make a new appointment.
I hope the above steps are helpful to you. If the problem still exists, please ask the hospital for help.