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:       What can I do for you today ?  
 Person2:I need to return a book .  
 Person1:        Can I do anything else for you ?  
 Person2:I want to check this magazine out .  
 Person1:        We don ’ t allow people to check out magazines .  
 Person2:Why not ?  
 Person1:        It ’ s just a policy of ours .  
 Person2:So what am I allowed to check out ?  
 Person1:        You may check out books or videos .  
 Person2:I need to check out this magazine .  
 Person1:        You will have to just read it in the library .  
 Person2:That doesn ’ t make any sense . 

informal