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:       May I help you ?  
 Person2:Could I check out this book ?  
 Person1:        Let me see your library card .  
 Person2:I need to get one .  
 Person1:        You can apply for one right now , if you ’ d like .  
 Person2:Okay . Let me do that right now .  
 Person1:        Could you fill out this application ?  
 Person2:I ’ m finished . Here you go .  
 Person1:        Could you please sign the back of the card ?  
 Person2:All right .  
 Person1:        That ’ s it .  
 Person2:Now may I check this book out ? 

formal