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:       Freeze ! Police ! Put your hands over your head !  
 Person2:What did I do ? I haven't done anything .  
 Person1:        You're under arrest for concealing illegal drugs .  
 Person2:What do you mean ?  
 Person1:        You are suspected of hiding illegal drugs . So we are taking you into custody .  
 Person2:I didn't do anything .  
 Person1:        We've found some heroin at your house .  
 Person2:No , I didn't . I'm innocent . Those aren't mine . Whatever you found is someone else's stuff . You can't prove anything . I wasn't there when you went in , and you can't prove it's my stuff .  
 Person1:        That may be , but you're still under arrest . And you'd better stop talking .  
 Person2:I don't need your help , jerk .  
 Person1:        Whatever you say . 

informal