For some reason, the originally booked air ticket for Air China at 9:05CA2865 on the morning of the 24th needs to be changed to 17:00CA2863 in the afternoon. How to change the ticket?

Airplane rebooking is conditional. It should be submitted 48 hours before the scheduled departure time of the original designated flight. The class of service will be changed, and the excess fare will be refunded. If the time limit is exceeded, there is no way to rebook.

Find your order, click "I want to change the booking", and then select the flight. (The change fee should be quite expensive)