英语翻译-飞机机位紧张

作为简练回答可以说“limited seat of the Spring Festival”
如果作为服务行业为乘客解释原因可以客气点说“sorry，the seats are quite limited of the the coming Spring Festival.”

Because it's the Spring Festival, so the seats are quite limited.

Due to the duration of Spring Festival, the flight seats are in short supply.

In time of the Spring Festival, the flight seats are in short supply.

It's the Spring Festival now, so the reservations of the scheduled flight are inadequate.