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:       Are you OK ?  
 Person2:Yeah . Why not ?  
 Person1:        Because ... I heard John got married yesterday .  
 Person2:Oh , you went to the wedding ?  
 Person1:        No , he didn't tell me about it . Don't feel bad .  
 Person2:I'm OK . I promise . Maybe you don't know that I have done with him for a long time . 

informal