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:       hi , Charlie ! What are you reading ? 
 Person2:hi , bob . I ’ m reading a biography ? 
 Person1:        who ’ s it about ? 
 Person2:it ’ s about bob Dylan . 
 Person1:        who is he ? 
 Person2:he ’ s a famous American musician . 
 Person1:        who ’ s the author ? 
 Person2:it was written by Howard sounds . 
 Person1:        what do you think about it ? 
 Person2:it ’ s great ! I ’ Ve learned a lot form reading it . 
 Person1:        can I read it when you ’ re done ? 
 Person2:sure , bob ! I ’ m on chapter 12 now , so I ’ m almost finished . 
 Person1:        how many chapters does the book have ? 
 Person2:there are 15 chapters in total . 
 Person1:        when do you think you ’ ll have finished reading it ? 
 Person2:I should be done by Friday . I ’ ll give it to you in class then . 
 Person1:        thanks . Charlie ! 
 Person2:no problem . Bob . 

informal