请各位英语高手帮我把一封感谢信译成英文。

如果是真实使用的话,不太会用"各位领导"的抬头吧,直接发到哪个相关部门, Dear sir/madan concerned 就可以了,

Mar.28th,2008
Dear honored management of ...company;
I am writing this letter to thank you for your trust in us and appointing us one of the suppliers for the DQ200 project. we promise here that we will provide sample before the 20th week of this year, without delaying your overall plan.
thank you again your trust and we are looking forward to our happy cooperation.
Best wish!
X XX