We seldom book hotels when traveling, we usually just take pot luck.

我们旅游时很少预定旅馆的房间，通常都是赶上什么样的就住什么样的。

This is like a pot luck where you and a friend each bring a dish and then both of you share both dishes.

这就像在家请客吃饭，你和朋友都准备了各自的菜肴，这样你们就可以分享彼此的美食了。