If you're talking about just dialogue choices in general, there's at least one dialogue choice in every one-on-one conversation with characters (minus a few exceptions). The general idea is that depending on which questions you ask characters in interviews, you get different information which might be helpful, ect. There is only one ending though, since all decisions do eventually tie into to the right ending, if that's what you're referring to?
I was planning on adding a free demo download to the page sometime later today, actually, if you want to just wait to try it yourself