Try to get to know her. Ask follow up questions to show you’re actually listening. Tell her you are interested in another date afterwards. Stuff like that, even if it sounds generic

I feel like flirting isn’t really something people do while dating nowadays. I (and probably some other women) find it more annoying if you wanna get to know the other person. Most flirting I like is after you’re already in a relationship, because you can be sure that the other person is safe and not a creep. Of course you still need to find a way to show interest