456, X Street, Y Avenue,
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear Jack Martinez,
This is to request for a credit limit increase from $6,000.00 to $8,000.00 on our corporate account. We have had to make several plane ticket purchases as well as hotel bookings in the past few months for our employees going on professional training. As such, we have realized the need to increase our limit. We are confident that this will be approved, as we have always paid our balance in full and on time.
Should you need any documents or further information, please contact us at 434-3434. Thank you very much for your help. We look forward to continuing our working relationship with you.