When faced with a situation where I don't know the answer to a customer's question, my first priority is to maintain transparency and honesty. I would let the customer know that I'm not certain about the answer, but will find out for them as quickly as possible. I would then consult available resources such as internal knowledge banks, other teammates who might have the necessary expertise. Once I've gathered the correct information, I would promptly get back to the customer with a clear and concise response, ensuring their query has been fully answered. This approach demonstrates both professionalism and commitment to providing an accurate information while maintaining a positive customer experience.