Here is an example of what I would do. The first one uses the Conditional Branch which checks to see if a certain item is in the player's inventory. If it isn't, it does the bottom half of page 1 and the guy tells the play where the dragon is and whatnot. If the item is in the inventory, it goes to page 2 using a self-switch. I made it where he says something and then he disappears by using the second self-switch and going to page 3 and leaving the graphic out.