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:       I find Beijing Opera is quite a bore .  
 Person2:Young people enjoy pop songs more .  
 Person1:        It's just like listening to a language which you know nothing at all .  
 Person2:But you don't have such a problem as to pop songs . 

informal