letter writitng- request for change in designation

Dear Mr. XYZ

Re: Change of Designation.

I would like to sincerely thank you for promoting me to the position of Assistant ["Asst." isn't wrong as an abbreviation, but in my view it's better to write the word in full here] Manager in XYZ Corporation. This is an opportunity for advancement, and I am very pleased to accept this offer promotion.

Sir As you know, that since last 3years I have for the past three years been working for projects (Execution) [If "projects/execution" is the name of a division/function of the company then this is OK, but it should be capitalised ("Projects"). If it isn't, then this doesn't read too well] and was not have not been associated with quantity surveying work [I think "surveying" would be the more usual word here, but ignore me if you know better] although I joined as a Quantity Surveyor. It is my request to change my designation from Assistant Manager, Quantity Surveying [again, ignore me if you know better] to Assistant Manager, Civil. [I'm not sure if this is correct or not. Should it be "Civil Engineering" or something? You would know, I guess.]

I would again like to again thank you and my other seniors for the expression of faith in my abilities that they you have exhibited by this gesture, and I assure you that I will definitely continue to be an asset to the company in my new role.

Respectfully Yours,