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:       Honey , do you know what color the carrot is ?  
 Person2:Mom , it's orange ?  
 Person1:        Wow , my son is so clever .  
 Person2:Mom , that's a stupid question .  
 Person1:        Really ?  
 Person2:I am not a child at all . I know more .  
 Person1:        Oh , my son looks like a grown-up .  
 Person2:Sure . Mom , I can take care of you .  
 Person1:        No kidding . So tell me what's your favorite color ?  
 Person2:I like blue . You see , that's the color of the sky . I wanna be a superman .  
 Person1:        Why ?  
 Person2:I hope I can fly to any place like superman . So I can touch the sky .  
 Person1:        OK , superman . Put on your cape , we are going to fly home . 

informal