One possible version:
Dear Tom,
I have retumed to my motherland. Thanks to your help, I lived a happy life and made great progress in my
English study in your country for half a year. It's well known that China is a country with long history. With
the Spring Festival drawing near, people will hold all varieties of activities. Welcome you to come here to
experience our Chinese traditional culture. In addition, it has been a long time since I saw Mr. Smith. I wonder
if he has a good time. Can you do me the favor to let me get in touch with him? Please give my best wishes to
him. Thank you very much in advance.