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:       Do you have any idea why I pulled you over today ?  
 Person2:I'm not sure .  
 Person1:        One of your brake lights is out .  
 Person2:Really ? I'm sorry . I did not know that .  
 Person1:        I'm going to give you a ticket .  
 Person2:Why can't you just let me off with a warning ?  
 Person1:        It's just a ticket .  
 Person2:How much is the fine ?  
 Person1:        The judge will let you know .  
 Person2:I have to be at court ?  
 Person1:        Of course .  
 Person2:All right . Just give me the ticket . 

informal