What happened when the official changed seats temporarily by bullet train?

There may be many reasons for the official temporary seat change of the bullet train, such as:

1. Tickets sold out or failed to leave in time after being sold out.

2. The train diagram adjustment or other reasons lead to the temporary suspension of some cars.

3. In order to ensure the safety of passengers or other reasons, it is necessary to change seats.

In short, in this case, you can consult the station staff and ask for help.