Resign for a good cause

Your name                                                                                             Date: ___________

Company name.  

I would like to resign my position as your position with company name on date. I would like to take this opportunity to say that making this decision has been difficult, as working at company name has been such a positive experience and one for which I am grateful. I have gained much here and have enjoyed working with you and my other colleagues.

I wish company name every success in the future and thank you for the opportunities I have been given during my time here.

Yours sincerely,
Your name