[英文,采纳有赏]实习最后一天，想发封内部邮件跟老板打个招呼

RT.英文的！

明天实习最后一天，想发封内部邮件跟老板打个招呼，英文该怎么写？
大意就是：
感谢他给我这个机会也感谢一直以来的关照和信任。顺便把简历付给他，有可能的话请他以后有机会再帮忙给我个机会。
写了开头就写不下去了。。。高人帮忙！

我的开头：I'm extremely greatful to you for your help and kind instruction during my internship. ......

Dear Sir/Madam,
I am extremely grateful to you for your help and kind instructions during my internship. I have learned a lot from my experience here. Tomorrow will be my last day, so I'd like to use this opportunity to express my sincere gratitude and say thank you one more time for all the support and trust you bestowed upon me.
Also, I am sending you a copy of my resume for future references. If opportunities occur down the road, please be so kind as to consider me as a possible candidate.
Thank you very much.
Sincerely,

I really appreciate the opportunity of working with you, and I am very grateful for the caring and trust you gave me. Here is my resume and please think of me if there is a chance to help me out...
thank you very much...

It is my last day here,turely thank your great help for all these days.during these days, you give me the chance to know a completely new world and enable me a great opptunity to full-develop my ablity.