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:       Hello , Joanna . You are looking very charming in the new dress .  
 Person2:Thanks . Does it suit me ?  
 Person1:        Yes , it suits you very well . It certainly is unique . I don ’ t think I ’ Ve seen anything like it before .  
 Person2:I know . That ’ s why I bought it . I hate wearing the same styles like everybody else is wearing .  
 Person1:        And the necklace , it matches your dress marvelously .  
 Person2:It ’ s very nice of you to say so . I should say you are glamorous yourself , as a matter of fact .  
 Person1:        Thank you for saying so . 

informal