456, X Street, Y Avenue,
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear Andrew hall,
Thank you for issuing a check to cover the expenses incurred during the last event we organized for you. Unfortunately, we were not able to have it encashed because the signatory was not recognized by the bank representative. Could you please replace the check or contact the bank to make the necessary clarifications? Thank you very much for your prompt response.