Flirtation is a lot easier and more comfortable when you know the person already likes you. And it can seem creepy to them if they don't already like you. So it might be good to not flirt until you're confident it will be well received and in the meantime just be friendly and sincere. An important aspect of potential relationships is not appearing as if you think someone's only value is if they're a potential partner. People talk to and know other people, so treating everyone well can improve chances of potential partners thinking well of you. Sometimes the best thing you can do to find a partner is to work on yourself.