I told Joe that I owned and operated companies that accounted for 4 of the last 6 jobs I have had. Also, I explained that I was moving between Colorado and Minnesota several times for educational reasons as well as personal/family issues.
Offer my best response. If that is not sufficient, or I'm not really aware what best to do, then the best course of action is to beckon the person in-charge to see if they will be able to assist/answer the question. In short, help if you can, call for backup if you are unable.