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:       What kind of books do you like ?  
 Person2:I like reading novels about early America .  
 Person1:        Really ? Me too .  
 Person2:Which one do you like best ?  
 Person1:        I prefer the novels by Hemingway , such as The Old Man and the Sea . I like the simple words in his novels .  
 Person2:Yup . Though the words he used are simple , but the spirit he has conveyed is great .  
 Person1:        Absolutely ! 

informal