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:       Recently , there prevails ' Net Love ' !  
 Person2:What's Net Love ?  
 Person1:        Two people chat on the Net and step by step fall into love ! It's Net Love .  
 Person2:Ridiculous ! They haven't met ! Maybe they're the same sex !  
 Person1:        Maybe yesterday you've received a man's woos . He's called ' Beast ' ?  
 Person2:How could you know ?  
 Person1:        I watched the screen display !  
 Person2:Do you know ' He ' is Ms . Rebecca !  
 Person1:        It's typical Net Love , and a typical lesbians ' homosex ! HA !  
 Person2:Impossible ! 

informal