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:       Have you heard that Mel Gibson was arrested by the police last week ?  
 Person2:No , not yet . Why ?  
 Person1:        For suspicion of driving under influence .  
 Person2:Oh . I am not his fan . 

formal