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:I ’ m returning a book .  
 Person1:        Do you need anything else ?  
 Person2:I also need to check out this video .  
 Person1:        This is all you want to check out ?  
 Person2:Just the video .  
 Person1:        I ’ m going to need your library card .  
 Person2:I have it right here .  
 Person1:        You ’ ll need to take care of the video .  
 Person2:I will .  
 Person1:        We will fine you if you damage it .  
 Person2:I get it . Thank you . 

formal