What was the part that you don’t understand sir? It says “Love” right here.

It seems to be a means of spreading good vibes, and simply could mean that you looked like you weren’t having a good day or that you held the door for someone else, or you were just lucky. But yes, the chances the cashier was flirting with you are non-zero. I’d say if it keeps happening, then maybe thats what’s happening.

Or you could always just ask. 😃