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:       Jack , what are you doing ?  
 Person2:I am reading .  
 Person1:        I can see that . But why are you reading advertisements for houses for sale ? Are you buying a house ?  
 Person2:No , not yet . But I like to see what is available .  
 Person1:        Can I have a look as well ?  
 Person2:Of course , have a seat .  
 Person1:        Oh , this one looks really good . And look at the garden . So beautiful .  
 Person2:Yes , nice . But I prefer this wooden house with a garden fence and a sloping roof .  
 Person1:        Yes , but my house has large windows and so gets lots of sun . And it has a small balcony at the top .  
 Person2:Well , you can't compare a small balcony to this large veranda . This is perfect for having a barbecue in summer .  
 Person1:        Talking about a barbecue , didn't you say you are organizing one next week ?  
 Person2:Yes , next Saturday . I hope you can make it . 

informal