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:       Hi , taxi.Could you take me to the financial street , please 
 Person2:Pardon , where to , sir ? 
 Person1:        I want to go to the financial stree . 
 Person2:All right . Hop in , please . 
 Person1:        Excuse me , how long does it take to get there ? 
 Person2:It usually takes about half an hour . 
 Person1:        Oh , does it really a long way to go . 
 Person2:Yes . Moreover , since the street is heavy with traffic this time of day . I'm not sure we can make it . By the way , are you pressed for the time ? 
 Person1:        No , I'm not.you can just drive slowly and carefully . 
 Person2:OK . 
 Person1:        You are very skillful driver . 
 Person2:Thank you . 
 Person1:        By the way , is the fair the same for any distance ? 
 Person2:No . It versa according to the distance , you can read from the meter . 
 Person1:        Oh , I see . 

informal