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 haven't danced for a long time .  
 Person2:Neither have I .  
 Person1:        We must go to a dance soon , or we'll forget how to dance .  
 Person2:Yes , we must . What have you been doing since I last saw you ?  
 Person1:        I've been studying hard for my examinations . And you ?  
 Person2:I've been learning Japanese every evening .  
 Person1:        Why have you been learning Japanese ? Why not English ?  
 Person2:I hope to visit Japan next year .  
 Person1:        Well , we'll both have to start learning all the new dances .  
 Person2:Yes , let's go into the dance-hall and ask if we can take dancing-lessons .  
 Person1:        A good idea . They can teach elephants to dance nowadays perhaps there's hope for us ! 

formal