和新的导师初次见面。
礼物里的小卡片上的寒暄话，
拜托各位了。英国人哦！

So your teacher's British, eh? Can't say that I remember the last time I saw someone from the U.K.

Anyway. You can say something like," Hi, welcome to China(Mr. or Mrs. whomever), I understand that it must be hard for you to move to a new country, learning a new language. I very much admire you courage and enthusiasm for becoming(being) a teacher and just wanted you to know how much you are welcomed and appreciated."

Sincerely yours,
(Then indicate your name here)