机票专业英文，懂的翻译下，谢谢

Question

REVALIDATION/REISSUE AND EMD ISSUANCE MUST BE
MADE WITHIN 24 HOURS AFTER CHANGE OF RESERVATION BUT NOT LATER THAN DEPARTURE OF THE ORIGINALFLIGHT BEING CHANGED. IF NOT DONE WITHIN 24 HOURS TICKET WILL ONLY BE VALID FOR REFUND OR NOT APPICABLE AT ALL.

Answer 1

改签以及电子收费凭证的发行必须在预定之后24小时之内完成，而且必须在原定航班起飞之前。如果您在24小时内没有完成，您可以进行机票的退款。另一种情况是机票已经失效。