Find below one of the sample format of the relieving letter...
This has reference to your resignation letter dated ___________ . This is to inform you that your resignation has been accepted and you are relieved from the services of Name of the Company on the close of working hours on Date.
You are requested to deposit the company Id and any other company property entrusted to you during your employment with us.
We wish you all success in your future endeavors.
For Company Name.,
16th February 2008 From India, Ahmadabad