If I've learned anything from my time at Kroger, it is that if someone gets pissed off, give them free stuff, apologize over and over, and find some employee to blame it on and say that they are new and you will make sure they receive better training.

Optimally, the best way would be to make sure there are enough employees and make sure they know stuff.  That's not going to happen though.  Kroger will always try to get by with the lowest number of employees being paid at once.  They will also do anything they can to prevent people from getting full time, plus the average time someone works there is short because the pay and treatment it so bad.  If a customer finds an employee and wants help, they expect him to know where stuff is, have a decent knowledge of the products, and know stuff about the store (when do sales run?  when do you stock stuff?  what is your return policy?  do you carry x?).  If the average employee worked full time and had been there for a while, we would be a lot closer to that.  Instead, few people have full time and most people are inexperienced.