"Maybe you can help me" is seriously my least favorite phrase to hear from a patron.
Dude, I get paid to help you. It is the main component of my job. I went to freaking grad school so that I could help you.
I'm pretty sure I can help you.
Also, what do you say to that? I mean, what do you say that is friendly and customer service oriented? "Yes, I can help you" with a perky smile is my usual reply, but even I get sick of that after awhile.