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 staying 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 very 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 that 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 ? 

informal