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 is your case against the police ?  
 Person2:They arrested me for nothing .  
 Person1:        What do you mean ?  
 Person2:They weren ’ t supposed to arrest me .  
 Person1:        Didn ’ t they let you go ?  
 Person2:They didn ’ t let me go until the next morning .  
 Person1:        So they kept you at the station ?  
 Person2:They sure did .  
 Person1:        Did they tell you why they arrested you ?  
 Person2:I matched the description of a robbery suspect .  
 Person1:        I understand .  
 Person2:I want to take them to court . 

informal