Ask for leave

Dear Joey,

I am Bai Dongyi, a student in PHE1031CB.My SID is 07608511.I would like to know if I could ask for a casual leave of absence for the class on Feb 4th. Because the train tickets on Feb 5 or 6 (only few days before the Spring Festival) are really hard to buy. So I plan to take the train back home on Feb 2.I play tennis every week except when the weather is bad. So I will try to make up the lesson myself.

Best wishes,

Bai Dongyi