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 that new song by the Beastie Boys ?  
 Person2:Why do you listen to rap ?  
 Person1:        It's not much different from that heavy metal music you like so much .  
 Person2:Heavy metal music is a lot different from rap music.You can dance to heavy metal .  
 Person1:        Hey , you can dance to rap music !  
 Person2:I can't dance to it . And I know you can't either . Because I've seen you try . 

informal