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:       How do you like skiing , Pat ?  
 Person2:I love it . All my life I wanted to learn to ski . Finally I took lessons last year .  
 Person1:        I suppose skiing is easy for you .  
 Person2:No , quite the opposite . I thought I'd never stop falling down . Then all of a sudden I started skiing much better .  
 Person1:        I see . Do you ski often ?  
 Person2:Every chance I get . On weekends I ski all day long . Sometimes I even ski at night .  
 Person1:        That sounds great .  
 Person2:Oh , yes . The ski slopes are well lit . It's really nice to ski at night . Why don't you learn to ski ?  
 Person1:        Not on your life ! I know I'd break my leg  
 Person2:Don't be so frightened . It's just a skill . 

informal