Formal resignation letter

(Date)

Your company name
Company address
Attn : Mr. XXXXX

Dear Mr. XXXXX,

I regret to inform you that I decide to resign from my present position with effect from (date - the day after your last working day) due to my personal reason. I hope my resignation would not cause you much inconvenience.

Thank you for giving me a chance to learn and gain the valuation experience in your company. I would be appreciate if you could provide me a reference letter before my leave.

Thanks for your kind attention.

Yours sincerely,
(sign here)