Dear Sir ：
我们刚接到货代通知，船在4月19日已开，但因较多的货船延误，提单还未及时发出；预计明日（4月21日）我们可收到提单，我们将发给您。
谢谢您耐心的等待 Dear Sir,We just received the notification from our freight forwarder, the ship had been departured on 19 April already, while since there were lots of cargo ships delayed, the B/L had not been sent timely; It is estimated that we can receive the B/L tomorrow (21 April), and we will send it to you then.Thanks a lot for your patience. Thanks & Best Regards,xxxx 希望可以帮到你纯手写，望采纳