别人写了一封英语感谢信给我，我怎么用英文回呢？英语高手急求一篇范文！谢谢

Dear xx,
Thank for your letter.
You say "Thanks" to me. I thinks i did what i should do. We are friends. So i'm very glade to help you. And we should help each other as friends. So if i have some trouble, you will help me. Right? i hope in the future no matter who is in trouble, we will give our hand. (中间可以再描述一些过程，和你的愿望）
Best wish.
Yours,
xxx

Thank you for me email ，I'm fine and you？

from：xxx
日期：xxx年xxx月xxx日

你先要明白他写信的内容，再根据内容去回答。如果你不会英语，可以通过在线翻译帮忙。