Definately go with Retail. Especially if you wear a tie or a suit while on the job.
To start, don't say what every retail person says when they approach a customer, "Can I help you with anything?" Why, that's a question that 90% of the time, people are going to say "No" to. Try something open ended, such as:
"What are you looking for today?"
"Who are you shopping for?"
"How's your old (insert large product here, like TV, car, sofa, stove, etc.) doing?"
The second one ("Who are you shopping for?") is my personal favorite. I thought of that one while working selling men's clothing, which is mostly female shoppers looking for something for their SO. I wanted to know which gals where single, while still apearing like I'm working (rather than hitting on her). After a time, I ran into a gal that said she was picking out a dress shirt for her brother's birthday. "Cool, she might be single" ran through my head. Gorgious asian woman too. And to make a long story short, she asked for
my phone number