I can usually start a conversation with a girl with circumstantial stuff such as: on campus I might ask "do you know where XXXX rez building is?" and may include "could you show me, I'm bad with directions" or when waiting for the bus today I saw this girl move toward the same bus I was going to as it approached the station but the bus didn't stop so I asked "do you know why the x didn't stop?" but then didn't really know what to say. Can anyone give me advice on things to say to keep a conversation going after (somewhat) opening/starting a conversation with a girl? Btw I'm 19 so most girls I target are 18-20, if that helps. Thanks in advance for any advice.