How to strike up a conversation with a girl across the street on the train

In fact, the main thing is to have a reason, this reason can be anything

For example, you ask your friend, I don't have enough cash on me, can I WeChat transfer to you, you change cash to me?

If the other side to see your quite good sense, you can say you thank you, you this avatar / name is quite interesting, I add you to transfer red envelopes to you:)

If the other side is willing to give you to change but nothing special good sense, you can say thank you, and then continue to talk to ask you to take the car to go where,

If the other side to say xx, you can unfold the place, you have been, XX This place is good I've been there before blah blah blah

If not, this place I have not been there, you are going to play? Blah blah blah