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:       excuse me ? How can I get to the nearest branch of the national bank ? 
 Person2:there ’ s branch on new street . Walk up this street until you get to the first set of traffic lights . Then turn right at the traffic lights . 
 Person1:        how far up the street are the traffic lights ? 
 Person2:not far . About 150 meters perhaps . 
 Person1:        ok . So I turn right at the traffic lights . Then ? 
 Person2:then keep walking until you reach the war memorial . It ’ s a big statue of a soldier . You can ’ t miss it . 
 Person1:        ok . Where do I go then ? 
 Person2:you ’ ll see the national bank near the war memorial . It ’ s a big building and you ’ ll see a big sign on the front of the building . 
 Person1:        got it . Thank you very much . 

informal