I'm studying in Europe. I booked Finnair, but it didn't work out. The original text is next, is it at DEC 3 5pm, and it will automatically cancel my reservation?
It means that your credit card is not acceptable, so you can contact them by phone (you may need to provide another credit card). If you don't contact them at 5 pm on December 3 (note that it is local time, so it is before 11 pm Beijing time), this reservation will be cancelled automatically. It doesn't matter. It can be fixed after the time.