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:       You're so witty ... 
 Person2:So why is the face tilted to the right ? 
 Person1:        This watch is supposed to be worn on your left hand . 
 Person2:So it's not as convenient for left-handed people ? 
 Person1:        It's better for right-handed people like me . See , I don't even have to move my arm to see the time . 
 Person2:I'm left-handed . You bought that watch so that I won't borrow it ... 
 Person1:        Bingo ! 

formal