answer: Samantha tells Mr. Patterson that he mistakes the dragon for a puppy and the train for a castle and that dragons aren't real.
documents: #Person1#: What a pretty pictur,e Samantha! That's a cute puppy.
  #Person2#: It's not a puppy, Mr.Patterson. It's a dragon.
  #Person1#: Oh, of course, and that's the princess in the castle?
  #Person2#: No, it's not. That's a train, not a castle, and the lady is buying a ticket.
  #Person1#: I see. Of course it's a train. I see the train tracks now.
  #Person2#: The train's in a field. There aren't any tracks around it. Don't you see the corn plants? They're just like the ones dad grows.
  #Person1#: Oh, I see it now. Does your dad have dragons in his field?
  #Person2#: No, Mr.Patterson. Aren't you a teacher? Dragons aren't real. Mom tells me stories about them when she gets home from the post office every day.