answer: #Person1# is tired out when walking the stairs. #Person2# cheers #Person1# up.
documents: #Person1#: Oh, I wish we had taken the lift.
  #Person2#: Cheer up. It's already on the 8th floor.
  #Person1#: But I am really tired out.
  #Person2#: Just think it's helpful for our health.
  #Person1#: Possibly, but if I know it was so far up, I wouldn't have suggested walking.