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 type of music do you like to listen to ?  
 Person2:I like listening to different kinds of music .  
 Person1:        Like what , for instance ?  
 Person2:I enjoy Rock and R & B .  
 Person1:        Why is that ?  
 Person2:I like the different instruments that they use .  
 Person1:        That's a good reason to like something .  
 Person2:Yeah , I think so too . 

informal