The conversation should flow naturally.
If you're going to stick to canned openers, try involving kino as well, maybe you could tap her on the shoulder and then ask...or try a funny opener, most girls respond well to funny things and if they see you as a funny guy they'll have an easier time continuing conversation
one i read from the paragon project crash course was:
(tap on the shoulder)
"i can't find my friends! you didn't eat them did you?

"
i think it goes without saying that you can't use this on overweight people,
but it's a neg, and a funny statement all in one, and a false time constraint, because it seems like you're going to have to leave to find your friends.
i don't know, if you're in a club just find someone dancing really goofy, and be like,
'haha, look how silly that person looks'
then it's story time
"i once had a friend who thought he was a great dancer.... but he really sucked....blah blah blah blah"
then get them to talk about their friends that suck at dancing.
remember to kino.
you'll get the hang of it eventually, conversations need to be natural
it's pretty safe to follow the path of:
open
say something about your surroundings
tell a story relating to that
pass her the story stick
it works for most situations...
the other day, i was outside on my friend's porch and a girl had been there.
opener: wow look at all the stars
hb: yeah, i know there's tons
me: my friend thinks that clouds are more fascinating than stars...we had a huge debate about it.
hb: omg! clouds are definitely not better than stars
me: that's what i was saying. he was saying how clouds are all different shapes and sizes and that they can be really mesmerizing on a nice day
hb: yeah...that's true
me: but i was like, stars are so far away, and there are millions of them out there, it's just so unbelieveable, when you think about it, that space is full of so many things when everything we need is down here.
etcetc.
just continue kino escalation, a high five went to her sitting on my lap.
only #closed...i have a girlfriend. a k-close was within reach though.
anyway, just be creative about it. that whole clouds vs stars thing never happened, i just made it up.
you have to be able to tell stories to build rapport.
another method is to skip opening and just assume they have rapport with you.