Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       How many people are in your family ? 
 Person2:As you know , China has a single-child policy . Therefore , there ’ s just my husband , my daughter and I . What about in your family ? 
 Person1:        I have one daughter and one son . Then there ’ s my husband and I . What about your parents ? Do they live with your family ? 
 Person2:Not anymore . They live with my brother now . and yours ? 
 Person1:        My parents live by themselves now . when they get older , they ’ ll probably go to a retirement home . Do you just have one brother ? 
 Person2:No , I have two older brothers and one younger sister . What about you ? 
 Person1:        I also grew up in a big family . I have one older brother and three younger sisters . 
 Person2:How long have you been married ? 
 Person1:        About seven years now . and you ? 
 Person2:I've been married for about five years . What do you think about divorce ? 
 Person1:        It ’ s becoming more and more common . However , I don ’ t ever want to get divorced myself ! What about you ? 
 Person2:If my husband cheated on me or treated me badly , I would get a divorce . 
 Person1:        If that happens , maybe you could marry my brother and we could become in-laws ! 
 Person2:( ha ha ) I ’ ll keep that in mind , but don ’ t tell my husband . 
 Person1:        Of course not ! 

informal