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:       Mmm . Nice and crunchy . And they leave a space uncovered for you to hold ... 
 Person2:They're so much fun to eat . You can suck all the coating off first ... 
 Person1:        Or just stuff the whole thing in your mouth at once ! 
 Person2:But that way you're not savoring it . 
 Person1:        Whatever . Give me another pack . 
 Person2:Hey ! The movie hasn't even started and they're almost gone ! 

informal