I was riding the bus today, when I caught a cute girl checking me out from a few rows down. As our gazes meet she smiles and looks away, I smile and laugh a little back at her, causing her too look and smile at me again.

After that nothing happened. I got off the bus, probably never to see her again.

Given that situation. (It was also a fairly busy bus) What would have a master seducer done? Any advice?