英语翻译我们很遗憾的告诉您,由于最近订单很多以至于交货期累积至9月底,所以我们希望您能重新考虑我们的交货期,如果您实在不

We are sorry to tell you that your delivery time will be the end of September due to too many orders on schedule recently. Therefore, we hope that you can reconsider and accept our new delivery time. If unfortunately, end of Sep. is not acceptable to you, we will have to consider to cancel the order.
贵司的态度,还是蛮强硬的.一般的工厂,只是尽量把话说得多么委婉,拖延时间而又不损失赔偿或定单,所以不会这么态度坚决.另外,取消合同是违约吧.虽然不一定会引起什么贸易纠纷,但是就交货期问题而取消合同,个人觉得处理得还是太过了些.