I'm going to accept the cashier paying me extra money even though I told her she gave me too much.
Why would you accept it then, has it got to do with anything?
Well I can always use the extra money.
I can see if they were being generous, but you shouldn't accept more money than you are owed. Even though they seem to be extra friendly, they could get in trouble for giving you more money.
I don't like people who think they have to be honest all the time. You should try to be more understanding.
The cashier could get in real trouble if the receipts don't add up at the end of their shift. They will lose money from their paycheck and have to take the hit.