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 this one ? It's nice and cheap It's only thirty-four dollars .  
 Person2:Have you got anything cheaper ?  
 Person1:        Sorry . I think that's the cheapest  
 Person2:May I try it on ?  
 Person1:        Yes . you can The fitting room is right over there .  
 Person2:All right . I think I'll take it . 

informal