Hello,
Please help me by taking a look at these two letters. I am writing it to two difference person.
Thank you in advance,

Direct Boss,
I just want to drop you a note to thank you personally for all the time you spent with me when I was in XXX and on Skype. Also, I thank you for your trust in me and believing in me with the position. I could not ask for more from my leader and your support really mean a great deal for me. I assure you that I will do always work my hardest!
In addition, I know that I would learn a lot from you and benefit greatly from your talent, wisdom, and experience. It is my pleasure to work with you.

___________________________________________
Regional Boss
I would like to sincerely thank you for giving me an opportunity with XXX. I am so grateful to be back and I assure you that I will try my hardest and will always work my hardest to help and support our company.
Your support, encouragement and your trust will help me excel my best ability to reach my career goals and that I am thank you.
It is my pleasure to work with you again.
Gratefully.
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