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 do you think of the test ? 
 Person2:Rather difficult . How about you ? 
 Person1:        It wasn't too bad . Were you nervous ? 
 Person2:Rather . I'm afraid I didn't do very well . 
 Person1:        Oh , I wouldn't worry about it . 
 Person2:That's because you did well . 
 Person1:        No , I wouldn't worry about you . 
 Person2:Why ? 
 Person1:        It seems to me that you always do better than you say . 

informal