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:       Hey , May , how are you doing ?  
 Person2:Oh , I'm a little busy these days .  
 Person1:        Why is that ?  
 Person2:Don ’ t you know Christmas is coming ? I have a lot of things to get ready .  
 Person1:        But you ’ re in China . Are you planning on going home for Christmas ?  
 Person2:Yeah , so I have to buy presents for everyone before I leave .  
 Person1:        Why not just give them money in red envelopes ? That would be much easier .  
 Person2:Americans don ’ t like giving money , they prefer presents you buy for them . So I have to figure out what to buy for all of my family and friends .  
 Person1:        I've got it . I won ’ t bother you any more . You ’ d better hurry to do it , Christmas is just around the corner .  
 Person2:I will . Merry Christmas . 

informal