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:       Taxi .  
 Person2:Get on , PLS . Where do you wanna go ?  
 Person1:        Thank you . Pls hurry , I am late . Can I get to the Battery Park before 4 ?  
 Person2:All right , Miss . I think we will get there if there are no delays on the way .  
 Person1:        How exactly do you figure out the car fare ?  
 Person2:According to the kilometer rate , the first five kilometers are 4 dollars and every kilometer extra costs 50 cents .  
 Person1:        Oh , I see .  
 Person2:Here we are , Miss .  
 Person1:        Thank you . How much do I owe you ?  
 Person2:You owe me 19 dollars .  
 Person1:        That's 20 dollars . Keep the change !  
 Person2:Thank you ! 

informal