I am writing this letter to inform you that I am taking my retirement from my position as project engineer with ABC engineering on August 9th, 2010. I will be no longer handling your account. I will miss working for the company and with my former clients like you and my colleagues.
And I like to thank you for your support over the past twenty years. I have enjoyed working at ABC engineering on your project. It was a wonderful challenge to me to help you in your projects. If you have any queries or if you wish to keep in touch with me, I will be available to you on my phone and also at mail. My number is 589647 and email id is email@example.com. I wish you a wonderful future and great success in your business.