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:       Have you heard of the Love Bug ?  
 Person2:Do you mean the ' I love you ' virus that attacks computers through e-mail ?  
 Person1:        Yes . It is one of the most harmful computer viruses in the world . People say it will break out again om Valentines ' Day this year .  
 Person2:This is terrible . Why do hackers play such a dirty trick ?  
 Person1:        Hackers are smart , and they want people to know about it .  
 Person2:So they create viruses to tell people they are smart ? That's really sick . 

informal