Yes, I think our software (Chat Mapper) is exactly what you are talking about. From interviews that we have conducted, many times developers use Excel but I'm sure there must be some in-house software as well. We are gearing up for the official release and we are in the planning stages of our follow-up software called Story Mapper. The goal there is to map out plot lines as well as conversations. The ultimate goal is to fully design the story in such a way that you can essentially export to a game design document.