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:       I was just about to go to bed when the telephone rang last night . 
 Person2:Who was it ? 
 Person1:        Kate . She said she was too excited to go to sleep . 
 Person2:She never cares about others . 
 Person1:        It ’ s true . Guess what we were talking about last night . 
 Person2:Her new boyfriend , right ? 
 Person1:        Yeah , how do you know about that ? 
 Person2:I was also interrupted by her last week because of such a thing . 

informal