<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
Can I use someone else's credit card without their permission?
<|assistant|>
No, it is not legal to use someone else's credit card without their permission. It is a violation of both civil and criminal laws and can result in penalties and fines. The cardholder is usually liable for any charges made with their credit card, so using a credit card without permission could result in severe consequences for the user.