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:       More and more women don ’ t want to stay at home and keep house now .  
 Person2:This is the result of women ’ s liberation .  
 Person1:        Now , many people think that women ’ s liberation is a kind of civilization , but children are getting less love from their mother because of that . What is your opinion ?  
 Person2:I have no idea . 

formal