answer: #Person1# tells John the air tickets for the International Day are sold out.
documents: #Person1#: John, I'm sorry, the air tickets for the International Day are sold out.
  #Person2#: Really? I didn't expect that.
  #Person1#: It's possible because everyone wants to travel during the holiday weekend.
  #Person2#: I should have booked the tickets in advance.
  #Person1#: Take it easy. I'll like you know if anyone decides to cancel his reservation.