When I don't know an answer to a question, I don't turn around and act like I know. I will either ask a manager or I will ask a peer in the group how to respond to it, but I always take it to my manager because they've been trained and they probably know a little better answer of the question, but I don't try to lie to get myself a sale. I just admit that I don't know, but I will find out the answer for you.