This is to acknowledge that we are in receipt of yournotice whereby you informed us that the goods shipped toyou on (date) did not conform to our agreement dated(date).We regret this unintentional mistake on our part, thereasons for which were (explanation)While we recognize that the time for performing under thisagreement has expired, we are requesting that you extendthe time to (date) in order that we may cure thedefect by replacing the shipment with goods that conformto our agreement.Please accept our apology for this inconvenience. We willbe looking forward to your response.