answer: #Person2# tells #Person1# the girl #Person1# admires is temperamental.
documents: #Person1#: Look! The girl is so beautiful and she is smiling at me. She is lovely.
  #Person2#: I can't agree with you. She's pretty, but she always blows hot and cold.
  #Person1#: What makes you think so?
  #Person2#: She's my sister, you know.