对于需要改签或退票的乘客，他们可以在12306平台上或在车站售票处就能改签或退款。

For passengers who need to change or return their tickets, they can change the tickets or get their fund through 12306.cn or the ticket office at the station.

youdao

我的计划改了，恐怕现在不能用这些票了。能不能退票，收回退款呢？

My planes have changed. I'm afraid I can't use these tickets now. Is it possible to return them and get a refund?

youdao

阁下需填写退票申请表，由于手续需时，退款将于表演取消后不多于一个月内转送至阁下之帐户。

Guest is required to fill in the refund form and the process time will take within 1 month.

youdao