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:       Are you ready ?  
 Person2:Yes .  
 Person1:        Who can tell us something about the author's life ? Volunteer ?  
 Person2:The author was a famous writer , and he was also a politician . He was born in 1911 and died in 1985 .  
 Person1:        Very good . Sit down , please . Susan , what's the general idea of the text ?  
 Person2:Can I answer it in Chinese ?  
 Person1:        No , you can't . This is an English class , and you have to express yourself in English .  
 Person2:Let me have a try . The author takes the characters peculiar to the British people as a topic to show that they are quite different from other nationalities . They are quiet , shy and reserved ...  
 Person1:        Excellent . Class is over . Let's have a break . 

informal