由于AI 文件迟迟没有按时发送给我们确认,我们不能再按照原来的时间交货.我们希望你能接受我们推迟1周的交货期来准备大货物

We cannot deliver the products on schedule,as we didn't receive the AI on time for confirmation.We hope that you can accept another proposal which delay the time of delivery for one week to prepare all the massive materials.
We apologise for any inconvenience,and appreciate your understanding!

Because the AI file has no time to send us a confirmation, we can't according to the original time of delivery.We hope you will accept our delayed 1 weeks of delivery for bulk material.Thanks.Please understand