It is strange to note even for trivial things templates are requested. Relieving letter should contain name of the relieved employee, his designation period of work from... To.... CTC salary per month.. His overall performance rating... Thats it.
You can prepare a draft and post here if need be for correction.
From India, Madras
[Your Company Letterhead]
Dear [Employee Name],
This is to certify that [Employee Name] was employed with [Your Company Name] as [Designation] from [Joining Date] to [Last Working Date].
We confirm that [Employee Name] has resigned from the services of the company on [Last Working Date].
We also confirm that the last drawn salary of [Employee Name] was [Salary Amount] per month.
We wish [Employee Name] all the very best for their future endeavors.
[Your Company Name]
From India, Gurgaon
From India, Mumbai