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:       What happened to your brother ?  
 Person2:It seems that he has gone ape over the girl .  
 Person1:        Your parents must be worrying about him .  
 Person2:Yes , he ’ s been like this for two weeks . We don ’ t know what to do .  
 Person1:        Have you talked to him ?  
 Person2:Yeah . But he just didn ’ t listen . 

formal