I’d stay calm and listen carefully to understand their issue, like if they’re upset about a price mismatch. I’d apologize sincerely, even if it’s not my fault, and offer a solution—like checking the price or getting a manager if needed. In my last job, I dealt with an angry customer by patiently explaining a return policy, and they ended up thanking me for the help. I think keeping a positive attitude and focusing on fixing the problem is key.