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:       The performance is amazing . I'm curious about how they did it . I mean the way they sing .  
 Person2:They must have practiced a lot . The perseverance has made them they are today .  
 Person1:        So cool . Someone gave me this flier at the exit . What's it about ?  
 Person2:Let me have a look . Well , it lists some shows that will be on next week .  
 Person1:        Oh , tell me about it . Anything interesting ?  
 Person2:Hmm ... Oh , this one , ' The Drunken Beauty ' . This is a real classic .  
 Person1:        ' The Drunken Beauty ' ? It's funny that we have ' Sleeping Beauty ' in my country . Anyway , what's it about ? Is the beauty a drunkard ?  
 Person2:Of course not . She was said to be the most beautiful woman in her time and that made her become the queen . They play was famous for its singing and dancing .  
 Person1:        Sure , people do that when they are drunk . What about the actress ?  
 Person2:She is an opera star in China . Her teacher's teacher is Mei Landfang .  
 Person1:        Oh , I've heard about him before . He even created a special dance of sleeve shaking .  
 Person2:You are such an expert on it . I don't know that .  
 Person1:        You know , interest is the best teacher .  
 Person2:So , want me to book the tickets again ?  
 Person1:        Please do that . I can't wait to come back again . The performance must be really amazing .  
 Person2:We can do that if you like . Maybe next weekend .  
 Person1:        That will be great . 

informal