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:       I have a problem .  
 Person2:What's the problem ?  
 Person1:        My mattress was supposed to be delivered today .  
 Person2:Is there a problem ?  
 Person1:        The delivery people showed up four hours late .  
 Person2:I apologize for their tardiness .  
 Person1:        I was late for work because of them .  
 Person2:Again , I do apologize for the inconvenience .  
 Person1:        I want my money back for the delivery .  
 Person2:Seeing as they were late , that won't be a problem .  
 Person1:        It shouldn't be a problem .  
 Person2:I'm going to refund your money right now . 

formal