I work in retail and think it's just great! Just look around at how rude and ignorant the american culture is now. Then just imagine how these people are going to treat you as a "sales person" while waiting on them.
Me thinks you need to think long and hard about retail. If you are good with people and REALLY enjoy talking to them you'll be fine. Reason why you need to carry a conversation is that people are bored and need someone to talk to so they'll think nothing of wasting your time, making you think they're interested, they're not, they just want to talk. Just imagine the me, me, me, me, me posters on here. You'll be waiting on the umm..... 98% of the time.