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:       Is this your umbrella , miss ?  
 Person2:Oh , yes , it is . Thank you . I was looking for it just now .  
 Person1:        You look a bit familiar to me . I wonder if I have seen you somewhere before .  
 Person2:Have you ?  
 Person1:        May I ask where you live ?  
 Person2:Just two blocks away , in that tall building .  
 Person1:        That ’ s it . I live there , too . I live on the sixth floor .  
 Person2:My family move in just two weeks ago . We live on the fourth floor .  
 Person1:        It ’ s a small world ! May I know your name , miss ?  
 Person2:I ’ m Chen Ming .  
 Person1:        How do you do , Miss Chen ? I ’ m Song Mei .  
 Person2:I ’ m glad to meet you , Mr . Song .  
 Person1:        Are you going to your office now , Miss Chen ?  
 Person2:No , I ’ m going to the airport to meet some friends from Beijing . 

informal