Different persons will have different views on this. If a person want to come close in very few days or hours he will talk such that i.e conversations would be such that girl will also like and will come close.
If talk of another person,who just want to have friends and later to some other relation,he will talk slowly i.e conversation will take slowly to final point i.e love.
Many views are there which can be possible.
I would like to chat with girl very frankly with respect and conversation will take as common.
I don't chat much but still I think I could share my views for the same. First of all while chatting we must remember that the person with whom we are chatting is of opposite gender and try to maintain some decorum for the same. Chat and at the same time give the person at the other end equal opportunity to express her opinion regarding the topic of the chat. In brief, try to create an impression on the mind of the girl sitting at the other end that you are a guy with some positive intent in it...
to get a girl for chating is very difficult and to have a long chat is more difficult. if you get one for chating you must have a great command in english which is better than her and the attitude of presenting should be very good. the topic of discussion must interest to the girl
It is difficult to do two things at a time. We cannot devote the same interest on both the things. Girl will understand the same and she will try to ignore us.