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:       So how much should I gamble ? 
 Person2:Why not fifty or one-hundred dollars ? 
 Person1:        Okay . One-hundred then . Do you think I will lose it ? 
 Person2:I don't know . You have to be smart , but you have to be lucky too.Some games are all luck . With some , you need to be smart . 
 Person1:        I want games that are all luck . 
 Person2:I knew you would say that ! Then you should play the slot machines . 
 Person1:        Slot machines ? No , I don't want that ! That's too boring . I want a game with cards or dice . 
 Person2:So what do you want to play then ? 
 Person1:        Blackjack.We can play blackjack . And I will gamble one-hundred , or maybe two-hundred dollars . 
 Person2:Huh ? You are breaking our rule already ! And we didn't even start to play yet ! 
 Person1:        Oh , don't be so strict ! We are in Las Vegas . 
 Person2:Yes , and if I stay with you , we will have to walk back home to New York.Because we will lose all our money and our plane tickets too ! 

informal