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:       OK , Nick . Here's the question , What movie and its sequel both won an Oscar for Best Picture ?  
 Person2:The Godfather and The Godfather II , of course . They were both directed by Francis Ford Coppola .  
 Person1:        Whew ! I'm impressed ! You really know your stuff !  
 Person2:Only about old movies , really ... 

informal