Personally I like when I am acknowledged when I am in the booth. Not followed around but at least eye contact and a "let me know if I can help" or "do you have any questions". I know if you are busy with someone it may be hard to do but try to at least make eye contact and a head nod so they know you see them. I have entered booths where the reps are standing around or sitting and talking to each other and never acknowledge anyone is in the booth.
Also do not assume the man is the one making the decisions. When my husband was with me he was always approached first and I was not given the time of day. He helped in the shop but I was the one making the decisions.
Just something to think about!