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:       Which of the two do you think is better ? I mean , what's the difference between them ?  
 Person2:Well ... this one costs more , but it has a much better sound.This part of it is made of wood , not plastic . And there's a tone control , too .  
 Person1:        I only want it for the kitchen . I like to listen to the news at breakfast time .  
 Person2:Hmm ... well , the other one is good for the money . It's much cheaper . We sell clot of them and all our customers are satisfied with them .  
 Person1:        Hmm ... I'd like the cheaper one , please . Can I pay hy cheque ?  
 Person2:Certainly . 

formal