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Say that you have enjoyed talking but that you have to leave. Let them know that you're not interested if they persist. Use "I" language to express discomfort with ongoing flirtation. Avoid giving your number to someone you don't want to talk to again.
There's nothing wrong with excusing yourself to send the message that you're not interested in flirting. You can also excuse yourself if you are feeling uncomfortable and you want to get away from them. Let them know that you enjoyed the conversation, but that you really need to go. For example, if you're out at a bar, try saying something like, "It's been nice talking to you, but my friends are waiting for me, so I really have to go." Or, you could say, "This has been fun! I have to head out, but enjoy the rest of your night!" If the person keeps trying to flirt with you, you might need to be direct with them to get them to stop. You can tell them in a nice way to avoid hurting their feelings, or be blunt if they're being pushy or disrespectful. This is also important to do if the person is a friend of yours who is interested in you or if you went on a date with them. For example, if you want to be nice about it, try saying, "You're such an interesting person and I like spending time with you, but I'm not interested in dating. I just want to be clear about that." Or, you could say, "I'm not interested, so please stop saying those kinds of things." If someone flirts with you on a regular basis and it's making you feel uncomfortable, it's important to let them know that. The person might be a coworker, classmate, friend, or someone else. Be direct about how you're feeling and begin your statement with "I" to reduce the chances that they will become defensive. This will help to send the message that you're not interested and you want them to stop. For example, you could say something like, "I feel uncomfortable when you compliment my body. Please stop saying those things." If someone continues to pester you and they ask for your number, do not give it to them! It's also not a good idea to give them a fake number as this can give them false hope of connecting with you later on. Instead, try to avoid being alone with the person as most people won't ask for your number in front of other people. However, if this doesn't work out and they do ask for your number, just say "no." If they persist, you could also say something like, "Sorry, but I don't think my boyfriend would like that very much." Even if you're not dating anyone, it's okay to pretend to have a boyfriend or girlfriend if someone keeps pestering you.