With due respect, I would like to inform you that my name is __________ (name) having employee ID ____________ (mention ID). I write this email to request you to issue me with a reference letter as I have to submit this document to the bank for ___________ (house/car/any other) loan approval.
Therefore, I request you to process my request and provide me with the reference letter at the earliest. If you wish to contact me, please do not hesitate to contact me at ___________ (contact details)
____________ (Contact details)