Dating just say
Try to let the conversation flow organically and only introduce new questions if the chat starts to lull.
Look for things you have in common and expand on these topics, but remember always to try to invite her to talk about herself whenever possible.
You can find an excuse to get together at a later date, such as a business-related meeting, or you can ask her directly to accompany you on a casual get-together.
Start with questions like where she's from and how long she's lived in the area and what she does for a living.
You can move from here into questions about what she enjoys doing in her spare time and what some of her interests and aspirations might be.
Once you've broken the ice, you can start making conversation that will help you start to get to know this girl.
One of the best ways to do this is to ask her questions about herself.
If you don't feel ready for this, yet, you might just say that you hope you bump into her again, especially if you think it's likely that you will.