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:       Whoa , whoa , what ’ s going on ? Watch out !  
 Person2:Hey , watch where you ’ re going !  
 Person1:        Oh , no ! I ’ m so sorry ! Are you all right ?  
 Person2:Oh ... I don ’ t know .  
 Person1:        I feel terrible , I really didn ’ t mean to knock you over . My tire , just exploded , and I lost control of my bike . Really , it was an accident . Please accept my apologies .  
 Person2:Oh , wait a second , you seem really familiar , I think I know you from somewhere .  
 Person1:        Yeah , I think we have met somewhere before . That ’ s right ! We met at Aaron ’ s place last weekend ! What a coincidence ! But anyway , I ’ m glad to see that you ’ re not too badly hurt , and I should probably get going . I have a nine o ’ clock meeting .  
 Person2:Ouch ! My ankle ! I think it ’ s broken ! You can ’ t just leave me like this ! Are you calling an ambulance ?  
 Person1:        Nope , I ’ m canceling my appointment so that I can stay here with you . 

informal