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:       Hi , Ann . I was wondering if you are free tomorrow night ? 
 Person2:Well , George . I guess I am . Why do you ask ? 
 Person1:        I've just gotten a pair of pre-sale Star Wars movie tickets from a friend and was thinking of inviting you along for the opening premiere . Are you interested ? 
 Person2:Yeah , definitely ! Thanks for inviting me . 
 Person1:        My pleasure . 
 Person2:I really wanted to watch the Star Wars on the opening day , but the pre-sale tickets were sold out . How did you manage to get hold of them ? 
 Person1:        A friend of mine works at the corporate headquarters of Pepsi , which is a major sponsor of the movie . He was able to get the tickets for free , and then he sold two more for me for 50 dollars a piece . 
 Person2:You paid 50 dollars for each ticket ? That's a huge premium over the regular price . 
 Person1:        Not really . Considering the fact that other people were willing to pay as much as 200 dollars each on the black market . Besides , I knew you were really looking forward to watching Star Wars on the opening day . 
 Person2:Wow ! I am really honored you went through all this trouble just for my sake . I really appreciate that . So , what time are we going ? 
 Person1:        Well , let's see . The movie stars at 10 . We should be there at least 1 hour earlier , because there is a big line . I could pick you up at your house at 8 , if that's ok with you . 
 Person2:8 pm , that's fine with me . 
 Person1:        Okay . 
 Person2:So I'll see you tomorrow then at 8 . 
 Person1:        Yeah , that's great . I'll see you tomorrow night . 
 Person2:Ok , George . Bye ! 
 Person1:        Bye , Ann ! 

informal