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 , is this the way to the Greta Wall ?  
 Person2:oh , it is really far from here . You ’ re going in the wrong direction actually .  
 Person1:        I must have taken a wrong turn .  
 Person2:it doesn ’ t matter . Go back the way you came . After about five kilometers , you ’ ll see a hotel on the side of the road . It ’ s a big one . You can ’ t miss it .  
 Person1:        and then ?  
 Person2:take the next right . Drive about one click further , and you ’ ll see the entrance of the highway to the Great Wall .  
 Person1:        thanks a lot .  
 Person2:you ’ re welcome .  
 Person1:        by the way , how long does it take ?  
 Person2:without traffic , it takes about an hour .  
 Person1:        I heard the Great Wall closes early in the afternoon . Do you think I can make it before closing ?  
 Person2:yes , I think so . It doesn ’ t close until 5 o ’ clock . You still have plenty of time .  
 Person1:        great ! Thank you !  
 Person2:my pleasure , and have a good time ! 

informal