<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
How can I get back at a customer who didn't give me a tip?
<|assistant|>
There's not really much you can do. It's unfortunate that customers don't always tip, and there's nothing that you can do to change that. If it bothers you, the best thing to do would be to let it go and focus on other customers who are more inclined to tip. If the customer does it again in the future, you could explain why a tip is appreciated, but otherwise it's just an unfortunate situation.