The one thing I would NEVER EVER do was say: Can I help you?

It never ceases to amaze me how many so-called sales people still say that day-after-day. And you know what? They get the same answer almost every time. "No, thank you. I'm just looking." There is no good reply to this.

What I would do is speak first and say, "Hi folks. Listen, we have some really nice floor mats, you want just one or maybe two so you can give one as a gift?

This gets them to do one of two things
#1. buy one or more of the floor mats. You'd be surprised how many floor mats I sold when we had those things.
#2. Say: "no thanks I was looking for ----------