<Name of supervisor/manager>
Dear <Name of manger>
After careful thought and consideration, I have decided to resign from my position as <Name of postion> with <Name of company> effetive <Date of your resignation take effect>.
I’d like to thank you for providing me with an opportunity to develop my skill set while gaining a new work experience.
I wish you, and the entire team at <Name of company> the best of luck in the future.