I am not sure why you would need to do this, but it would seem to me that it would be much better if the quest dialog was saved directly into the quest notes field of the quests window. For some reason there appears to be a real culture of making life difficult for the players -- you can't copy/paste dialog into this field and you have to remember to specifically save any information you type into it. Not everyone who uses a computer is or wants to be a master typist.
Typing is the biggest barrier I have to role playing in this game, it just isn't fun for me if by the time I've finished typing something the conversation has made my contribution obsolete.