Everybody has a learning curve and just because you started working at a place this week doesn't mean you are supposed to know everything about everything in the store.
I was in on Friday night looking at knives and neither of the fella's working at the counter could offer a whole lot of help about the differences between the two I was looking at, but they were helpful, polite, looked up the specs on the internet and we figured it out together and didn't try to pretend they knew more than they actually did and spent a lot of time with me. I appreciated that and they will only get better and more knowledgeable the more questions they get asked.
I have a lot of respect for anybody that has to stand in that store for 8 hours at a time and listen to those pop guns going off over and over and over again...put some of those things in the hands of a few terrorists and I think I'd be confessing to whatever they wanted to accuse me of !!!