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:       Wanna chill out and watch cable ?  
 Person2:Wow ! Besides The Cosby Show , I've never seen a black sitcom . What's this program ?  
 Person1:        It's a drama called Soul Food . This channel is BET-Black Entertainment Television . It has black shows , news and commercials .  
 Person2:This show is like a black Friends .  
 Person1:        BET has black shows that are overlooked by mainstream white TV .  
 Person2:That's cool . I've heard LA has an all-Asian channel on cable . 

formal