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:       Thanks . Sometimes talking with a friend is a great way to get over something . Do you mind if I vent a little bit ?  
 Person2:Of course not . If you're feeling bad and want to let your emotions out , you can just say whatever you want to me .  
 Person1:        Great , because I am really mad at William . I mean , what kind of an idiot wouldn't be able to appreciate a smart , beautiful woman like me ? Anybody who would be friends with that guy has to be really dumb .  
 Person2:Uh , A ... you know I'm friends with William .  
 Person1:        Oh right ... present company excluded , of course ! 

informal