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:       Did you watch the movie program on Channel 6 last night ?  
 Person2:Yes , I did . It is a horrible movie .  
 Person1:        I wonder why TV programs often show much violence .  
 Person2:Actually , more and more people have realized that violence on TV may lead to the increase of crime rates among teenagers .  
 Person1:        They are especially harmful to teenagers .  
 Person2:But anyhow there are many worthwhile programs . 

formal