The first conversation is linear/scripted - there is no way to make a mistake. There is onboarding in the game - there are a few tutorials in the other conversations.
Because I didn't want to bombard the player with too much stuff at the beginning. You can select only the right action (the other actions turn red and nothing happens when you click them). You chose what is important to remember. If I put explanations you might think all of it is somehow important. It is, but not at the start. Think of the start as a storyboard.