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's your favorite magazine ? 
 Person2:Off hand , I'd say the Reader's Digests is my favorite . 
 Person1:        What kind of magazine is it ? 
 Person2:It's instructive and inspiring . 
 Person1:        Really ? It is a weekly , isn't it ? 
 Person2:No , it's a semimonthly . 
 Person1:        Does it enjoy popularity among the young generation ? 
 Person2:Yes , it's so popular that it's sold out as soon as it reaches the bookstores . 
 Person1:        Oh , I think I should try to read one . 

informal