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:       You ’ re a big fan of Andy Lau , aren ’ t you ?  
 Person2:Yes , I ’ Ve been got all his albums and most of his films on DVD . I adore him . He ’ s my idol .  
 Person1:        How come you don ’ t have all of his films on DVD ?  
 Person2:Some of his early films are hard to find nowadays , especially the ones where he only played a bit part .  
 Person1:        I see . I ’ m sure you ’ ll find them one day . I see you also have several poster of him .  
 Person2:Yes . These posters are new . I bought them last week and put them up on my bedroom walls yesterday .  
 Person1:        Are you a member of his fan club ?  
 Person2:I was , but then I discovered you can find out everything for free on the internet , so I ’ m not a member now .  
 Person1:        Did you see the interview with Andy Lau in cosmopolitan magazine last month ?  
 Person2:Of course ! I bought two copies .  
 Person1:        Two copies ? One to keep and one to cut the pictures out of , right ? 

formal