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:       Good morning , Miss Wang . How beautiful you look today !  
 Person2:Thank you . I'm wearing make-up .  
 Person1:        Who taught you to put on make-up ?  
 Person2:It's me . I have studied make-up at a beauty shop .  
 Person1:        Can you teach me how to do make-up ?  
 Person2:Of course . First , use eye shadow to heighten your eyes .  
 Person1:        What eye shadow do you think is the most fit for me ?  
 Person2:I think pink eye shadow is popular among Chinese girls .  
 Person1:        How do you protect yourself from chapped lips ?  
 Person2:I suggest you use lipstick , which also accentuates your lips .  
 Person1:        How did you grow such long nails ?  
 Person2:You have to pay attention to trimming them from time to time . 

formal