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:       Merry Christmas ! 
 Person2:The same to you ! 
 Person1:        Are you doing anything special ? 
 Person2:We're having some friends over.What are you doing ? 
 Person1:        Oh . I'm just going to take it easy . 

informal