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 bought War Craft 2 yet ?  
 Person2:Yeah ! I bought it the day it was released .  
 Person1:        How do you like it ?  
 Person2:It's a great game . There are a lot of new characters .  
 Person1:        Did it cost very much  
 Person2:It cost about thirty . Most games cost about that much .  
 Person1:        Mechwarrior is such a good game . The graphics are awesome !  
 Person2:Oh , I know what you mean . I'm addicted to that game .  
 Person1:        My roommate always wants to play it . But I told her to buy her own game .  
 Person2:Yeah , my roommate likes to watch me play . He says it's like watching a movie .  
 Person1:        I've never seen such good graphics .  
 Person2:And I've never heard such good sound in a game . 

informal