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:       Excuse me , sir ?  
 Person2:Yes ?  
 Person1:        I'm afraid you can't smoke here .  
 Person2:Why not ?  
 Person1:        Can't you see the notes here ?  
 Person2:I'm sorry . I can't . What does the note say .  
 Person1:        It says ' No smoking ' .  
 Person2:Sorry , I'm very near sighted . 

informal