第一句：Have a nive trip!
旅途愉快！

A: Next week I'm going to Hawail for my holiday.
下周我要去夏威夷度假。
B: Have a nice trip!
旅途愉快！

第二句：Good luck!
祝你好运！

A: I'll visit Disneyland with my wife and children a couple of days later.
过几天我将和我的妻子和孩子们去迪士尼乐园玩。
B: I hear that there are often a lot of people there at this time of year.
我听说每年的这个时候会有很多人去那儿参观。
A: Oh, really? I hope there are not too many people then.
哦，是吗？我希望我们去的时候人不是很多。
B: Good luck!
祝你好运！

知识延伸：

表达良好祝愿还可以说：
Have a good trip!/Have a good journey! 旅途愉快！

May you have a wonderful journey! 祝您旅途愉快！

And a safe landing! 祝您平安到达！