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:       My old man always harps on me .  
 Person2:So does my father . I'm already used to it .  
 Person1:        But I can't bear it , John .  
 Person2:How dare you say that ? What they do is just for our good .  
 Person1:        Yeah , but he really puts blame on me . 

informal