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:       Who is your favorite music composer ?  
 Person2:I don't have one single favorite , but these days I listen to a lot of Chopin .  
 Person1:        Then you must despise such modern music as rock ?  
 Person2:Without doubt , rock is trash . 

formal