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:       Your family must be busy shopping for Christmas , now .  
 Person2:Oh yeah and decorating the house too was colored paper and pictures . they will put a Christmas tree just inside the front door , pained toys and colored electric lights along the branches and plays all the gift packages under it .  
 Person1:        Woo , your home will beautiful on Christmas .  
 Person2:Sure our thing .  
 Person1:        I do wish your christmas and happy new year .  
 Person2:Thanks . 

informal