answer: #Person1# and #Person2# missed the Book Building because they got off at the wrong stop. They will take a taxi if #Person1# keeps the secret.
documents: #Person1#: Dad, where is the Book Building?
  #Person2#: I'm looking. Can you still remember what the conductor said?
  #Person1#: She said that when we get off the bus, the Book Building is right by the bus stop.
  #Person2#: But I don't see it.
  #Person1#: Oh, Dad, look at the sign, please!
  #Person2#: Oh, my god! We get off at the wrong stop. I'm so sorry, honey.
  #Person1#: OK, Dad, it happens.
  #Person2#: It's my fault. So what can we do now? Walk?
  #Person1#: Come on, I'm too tired!
  #Person2#: OK, you promise don't tell your mother about it, we'll take a taxi.
  #Person1#: Sure, I promise.
  #Person2#: If you keep your promise, I will also let you watch Ultraman this evening.