You have smalltalk at the cash register? All I say there is: ‘Hi!’ or ‘Good [part of the day]!’, cashier essentially repeats the same thing; the cashier scans groceries, I put them back into my cart, then when they’ve been scanned the cashier reads out the price, I pay, cashier gets ready to ask if I want a receipt, but I cut them off saying ‘I don’t need the receipt! Thanks, bye!’