Overtime payment

[poongodi]

Please correct my letter.
Respected sir,
Sub: Request to pay overtime allowance-reg
I have involved in the suspense account reversal activity on 5/02/18 and worked 2 hours beyond the working hours(I have done overtime for 2 Hours). Therefore, I request you to pay the overtime allowance and credit the same into my savings account.

[emsr2d2]

We don't use "Respected sir" to open a letter in BrE. However, if you're writing to another speaker of Indian English, it might be acceptable. I would expect "Sir" to be capitalised though.

What is "allowance-reg"?

"I have involved" is wrong. Perhaps you mean "I was involved in ..."

Just say "I did 2 hours' overtime".