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:       Dad , can I have a pet ? I did what you said and passed all of my exams .  
 Person2:Then I guess you get to have a pet . Do you know what you want ?  
 Person1:        I want a dog . My friend Mindy's dog just had puppies and she said I can have one .  
 Person2:You know who will be responsible for feeding and cleaning and all of that stuff ?  
 Person1:        I know , I know . I will do it all by myself .  
 Person2:Have you figured out the costs involved with feeding and caring for it ?  
 Person1:        Yes . It will cost me about $ 50 a month . And I make a little more than that already .  
 Person2:Sounds like you've done your homework . I think you're ready for this . 

informal