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:       Want to meet for lunch this Saturday ? 
 Person2:Sorry , I can ’ t . I ’ m busy . 
 Person1:        What are you doing ? 
 Person2:I always do volunteer work on the first Saturday of every month . 
 Person1:        What kind of volunteer work ? 
 Person2:I help out at the children ’ s hospital . I help plan activities . 
 Person1:        Oh , yeah ? 
 Person2:Yeah . It ’ s exciting . This month we ’ re doing crossword puzzles . 

informal