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:       that was a great party . Thanks for saying behind to help me clear up .  
 Person2:it certainly was a great party . It ’ s a pity that a glass and a plate got broken and someone spilled a drink over here .  
 Person1:        I expected that something might get broken . That doesn ’ t bother me . That spilled drink won ’ t leave a stain , will it ?  
 Person2:I doubt it , I ‘ ll deal with it right away . Luckily it wasn ’ t a glass of red wine , I ’ ll just get a bowl of water and a cloth .  
 Person1:        I ’ m going to put all the rubbish into this big plastic bag .  
 Person2:afterwards , we can do the washing up together . Everything will be finished within an hour . Your friend Keith is really funny . I liked his magic tricks .  
 Person1:        yes , he ’ s very good .. isn ’ t he ? He told some funny stories too .  
 Person2:Amanda told some very funny jokes . At the beginning of the party , she was being ver serious .  
 Person1:        I think that she had a litter too much of the punch .  
 Person2:what did you put in that punch ? It tasted great , but was quite strong .  
 Person1:        that ’ s my little secret . Did you like the snacks and I prepared ?  
 Person2:very much . The birthday cake was delicious , wasn ’ t it ? Emily told me that she and karen made it themselves .  
 Person1:        that cake tasted so good ! It disappeared within minutes , so I think everyone liked it a lot . How ’ s that stain ?  
 Person2:all cleaned up . Are you ready to start on the washing up . 

formal