Honestly I just walk up to em and say "excuse me, I don't mean to bother you, but may I ask you a question?"
Her - sure
Me - what's your name?
Her - *gives name
Me - oh ok look, ima keep it real with ya. I saw you standing over there and thought you was kinda cute. I just had to come over and say something to ya.
Like I'm just blunt as hell
I've done it so many times and got so much pu55y from that direct approach.
Women love that. Just step to her with confidence and make sure to smile (after all you are a stranger). Ask her name and give a quick compliment. Giving a compliment right away will let her know right away what your intentions are. You wanna establish right away that you are SEXUALLY attracted to her.
After you tell her that you thought she was kinda cute, read her body language and go from there.
Honestly you just gotta do it and practice thinking on the fly. Every woman is different and there's no set way to do it.
I think the direct and blunt way is the best. Just my opinion. That's what's worked for me. I don't fukk with "lines"