If a girl asks you, "Do you know me?" you can respond in a friendly and honest manner. Here are a few possible responses:
If you do know her: "Yes, I think we've met before. We [mention the context of your previous meetings or where you've seen her]."
If you don't know her: "I'm sorry, but I don't believe we've had the chance to meet yet. I'm [your name], by the way. Nice to meet you!"
If you're not entirely sure: "I'm not entirely sure if we've met before. I'm [your name]. Could you remind me where we might have crossed paths?"
Remember to be polite, respectful, and open in your response. If you have met before, sharing a specific context or event where you interacted might help jog her memory and facilitate a more engaging conversation. If you haven't met, introducing yourself with a friendly demeanor is a great way to start a conversation and get to know each other better.