The dialogue is in order in the '.lbs' files. Two bytes length, then the string at two bytes per character:
http://i.imgur.com/1n64oLz.png
The file in the picture, 'room_00_01.lbs', contains the text from when you first talk to young Arino. If you play through and write down the text, then look through there, you should be able to figure out what's what. Like I said, it all seems to be in the order that it's displayed in.
EDIT: There seem to be some control bytes or something in that first string. The text('うわっ!'...) starts at the '5B 7D 12...'. Also, I messed up my highlighting a bit, but you should still be able to see what I mean.
http://i.imgur.com/1n64oLz.png
The file in the picture, 'room_00_01.lbs', contains the text from when you first talk to young Arino. If you play through and write down the text, then look through there, you should be able to figure out what's what. Like I said, it all seems to be in the order that it's displayed in.
EDIT: There seem to be some control bytes or something in that first string. The text('うわっ!'...) starts at the '5B 7D 12...'. Also, I messed up my highlighting a bit, but you should still be able to see what I mean.