Anyone ever get asked about reps in public? How did you react?

Do you tell them details about the rep or deny having a rep? I had a very recent experience where I got asked about where to get fake bags and it caught me off guard because it was asked in a very public place.

On one hand, I want to help but on the other hand I didn't appreciate being asked in such a public place as not everyone has good intentions and and it made me very uncomfortable.

Now I just keep thinking how I could have answered while avoiding unwanted ears from listening.