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:       Tom , aren ’ t you a little too old to be trick-or - treating ?  
 Person2:What are you talking about ? Where is your Halloween spirit ? Didn ’ t you ever dress up in a costume and go around the neighborhood trick-or-treating with your friends ?  
 Person1:        Of course , I did , but when I was ten ! Trick - or-treating is for kids , plus , I ’ m sure people will think you ’ re a kidnapper or something , running around with kids NCP at night .  
 Person2:Whatever , I ’ m going next door I heard Mrs . Robinson is giving out big bags of M & Ms ! 

informal