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:       I can ’ t believe the cost of apartments in New York City .  
 Person2:Oh , you didn ’ t know that apartments here are considered valuable , even if they are small and crowded ?  
 Person1:        Of course I had heard about that , but now I know how expensive it is to rent a place here .  
 Person2:I don ’ t mind paying high rent to live in New York .  
 Person1:        Why ? You pay so much for such a tiny space to live .  
 Person2:Yeah , but so what ! I ’ m proud to live in the world ’ s most exciting city . And , the salaries here are the highest in the nation , too . 

informal