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 heard the film was after the novel The Godfather .  
 Person2:Who wrote it ?  
 Person1:        Mario Puku .  
 Person2:Who're the producer , the director , the stars , heroine and the hero ?  
 Person1:        I'm always interested in how , but seldom pay much attention to who . 

formal