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:       Do you need help with something ?  
 Person2:I ’ m looking for this book .  
 Person1:        Is there something wrong ?  
 Person2:I don ’ t see it on the shelf .  
 Person1:        Did you check the computer ?  
 Person2:I already looked .  
 Person1:        Did it say anything ?  
 Person2:It said that the book is on the shelf , but it isn ’ t .  
 Person1:        I ’ m sure I can get it from another library .  
 Person2:Could you do that ?  
 Person1:        I ’ ll let you know when I get the book in .  
 Person2:That ’ s great . Thank you so much . 

informal