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:       How may I help you ?  
 Person2:I couldn ’ t find the book I was looking for .  
 Person1:        Have you checked the database ?  
 Person2:I checked .  
 Person1:        Was it on the shelf ?  
 Person2:It should have been , but it wasn ’ t .  
 Person1:        Maybe someone took it .  
 Person2:Will you be getting another copy anytime soon ?  
 Person1:        I ’ m sure we will .  
 Person2:Would you be able to reserve it for me ?  
 Person1:        I sure will .  
 Person2:Thank you very much . 

informal