"You Look Familiar"

So the guy at the register decided to give me a ten percent discount for my purchase (a new pair of jeans!). I did not ask for it but of course, I said "oh wow, you didn't have to" and smilingly thanked him profusely. He, then, said "You look familiar. Have I met you somewhere?" and pointed to his name tag and said "My name is ...." And I said "Uh, I don't think so. You don't look familiar at all." And left with my purchase. Does that line work for a lot of guys? Or did I think too highly of myself and assumed he wanted to know my name? Did I lead him on by smiling while thanking him? I love my jeans, by the way.