Tell me what I can do, not what I can't. Figure out a way to ring the register. Smile and be friendly. After 30 years in management, it's pretty pathetic that all you can serve as is a bad example. Even if the customer is upset, they're still the customer.
Good managers show empathy and ask questions before they make a statement.
My nieces had a bad experience in Dillard's and ended buying someplace else. Not for a long time. How many others will they tell about this episode. As many as they see. A well-done ad, must have cost a fortune.