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 just finished reading this article ' Getting Old Gracefully ' . It's a very good article .  
 Person2:What does it say ?  
 Person1:        A lot of things . There is a part about how old people should accept being old and stop feeling restless . You really should read it .  
 Person2:Thank you . But I don't think I'll bother .  
 Person1:        Why not ? What this article says makes good sense to me . If you read it , I'm sure you'll agree with me .  
 Person2:I don't think I'll have any trouble with getting old . But perhaps you can keep the article for a while , I may read it later . 

informal