第一句：Excuse me. Are there any unreserved first class cabins?

请问还有头等舱票吗?

A: Excuse me. Are there any unreserved first class cabins?

请问还有头等舱票吗?

B: No. All first class cabins are reserved. But there are still some second class cabins.

没有了，头等舱票全被预定了，不过二等舱票还有一些。

A: Then I want to reserve a berth of second class cabin.

那就给我订一张二等舱的卧铺票吧。

第二句：Excuse me, do you have any tickets avaiable for July 8th?

打扰了，请问你们有7月8日的票吗?

A: Excuse me, do you have any tickets avaiable for July 8th?

打扰了，请问你们有7月8日的票吗?

B: Sorry. All are sold out.

对不起，全部卖完了。

买船票的一些相关说法还有：

Where am I supposed to pay the excess fare?

我应该在哪里补票?

I'd like a refund on this ticket.

我要退这张票。

Do I need a reservation to go by ship?

我坐船去需要预定吗?