I'm using 'Hey I know this is super random but I just thought you were cute and wanted to meet you.'

And she's generally like 'cool' and then it's like now what?

I've tried observations about her or the environment, asking her where she's from or what she's doing but it only seems to be a topic for maybe 30 seconds tops, I guess right now I'm just really struggling with transitioning into and maintaining a fun conversation...