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 ! Taxi !  
 Person2:Where to , sir ?  
 Person1:        I ’ d like to go to the railway station please .  
 Person2:Please hop in .  
 Person1:        Is it a long run to the station ?  
 Person2:It ’ ll take about 20 minutes .  
 Person1:        The streets are heavy with traffic at this time of a day , are they ?  
 Person2:Yes , they are .  
 Person1:        Is it the rush hour now ?  
 Person2:Yes , it is . Are you in a hurry sir ?  
 Person1:        No , I ’ m not . Would you please drive slowly and carefully ?  
 Person2:Yes , sir . 

formal