person A: While I was at the grocery store I was in line behind a nice_comma_ but very confused older person who had trouble getting their credit card to work.
person B: That can be frustrating. Did you do anything to help?
person A: No_comma_ I thought the cashier was going to help her_comma_ but instead_comma_ she started getting very frustrated and began saying some very mean and ugly things to the customer. 
person B: Oh that is terrible_comma_ cashiers should have more patience.