Please accept my resignation from Company Name effective Insert date. Before leaving, I would like to offer my full cooperation in making this a smooth transition, so that my departure would not have any impact upon you, my team mates and/or our customer.
I have accepted another opportunity which I believe to be the next step in my professional development. My resignation is certainly not a reflection upon Company Name. I have very much enjoyed my tenure and feel that I have learned and grown during my time here. Working with you and your team has been a pleasant and rewarding experience.
I wish you and Company Name the best of luck for the future.