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:       I just got a letter from an old high school buddy .  
 Person2:Really ? That's nice .  
 Person1:        He usually keeps me posted .  
 Person2:I've been completely out of touch with my old friends .  
 Person1:        It's hard to keep up contact when people move around so much .  
 Person2:Yes , people just seem to drift apart . 

informal