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:       Betty , would you please read this letter of application I've just written ? I'd like to have your opinion .  
 Person2:I'd be glad to tell you what I think .  
 Person1:        Good ! I'm interested in your advice .  
 Person2:If I were you , I would change the beginning . You should write about your education first because we like to judge a man by his abilities .  
 Person1:        Good idea , Betty . What would you think about the second part ?  
 Person2:I think it's too short . You'd better say something about your work experience .  
 Person1:        You're right , I'll change it . How about the last part ?  
 Person2:Very good . But you should talk about your family , too .  
 Person1:        I agree . I appreciate your helping me . 

informal