Throughout the game you are presented with dialogue choices, do these matter in any way? I have found talking to some NPCs down a certain "route" will eventually lead to an item reward, but I can just try every route with the NPC and get that reward (at least so far)
As for more important things, like story dialogue, does this have more permanent effects? like character friendship or something? Is a dialogue choice I made early on going to have a butterfly effect for dialogue later?