regulations on ticket change
1. Friends who can't take the bus according to the stipulated time, date and train number can only change their tickets, and they can only change their tickets once.
2. you can change to other trains during the pre-sale period more than 48 hours before the start of the train (remember that it is more than 48 hours, excluding 48 hours).
3. within 48 hours before departure, you can change to other trains before departure, or you can change to other trains after departure until 24: on the ticket date. To put it simply, you can't choose a ticket with a face date of the next day or later.
4. You can still change your ticket when you drive, only on the same day. And this change can only be made at the station window. And this changed ticket can't be refunded.
5. If you change your ticket to the station, you can't change it.