How to reply to foreign trade letters and telegrams after receiving the other party's urging for delivery?

Hello, let me give you an example to tell you why the other party can't deliver the goods and deliver the goods according to the time stipulated in the contract.

Dear gentlemen,

Thank you for your letter of February 2, requesting the early delivery of the goods under purchase contract No.765.

We contacted the shipping company and regret to tell you that we can't meet your requirements.

Request settings. We were told that there were no seats left on the ship sailing from here to ...

Your port is before May 5th.

We are very sorry that we can't advance the shipment. However, we will do everything possible to ensure that the goods are shipped within the time stipulated in the contract.

Yours faithfully,

It is very difficult to fight unarmed. I hope it is useful and can be adopted.