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:       What would you like to be in the future ?  
 Person2:A teacher .  
 Person1:        But if I were you , I would be a singer . You've got such a beautiful voice .  
 Person2:I wouldn't like to be a singer , but I'd like to become a music teacher to teach children to sing , That dream developed in my mind when I was a child .  
 Person1:        Are you sure about that ?  
 Person2:I'm quite sure . I've always loved working with children . 

formal