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:       Sometimes I think television is too biased . None of them are completely objective . 
 Person2:That's unavoidable , but think , How would you keep up to date without television ? 
 Person1:        Newspapers or the radio I guess . I just wish TV was more objective . 
 Person2:Look , you can still learn a lot from watching television , you just need to be smart when you're watching . Filter the information and decide if you believe what you are hearing or not . 
 Person1:        The internet's a lot worse . 
 Person2:Really ? Why ? 
 Person1:        There's no one moderating it . Anyone around the world can put information onto the net for anyone else to see . The information on the internet is mostly unsubstantiated and you can never know who has written it , or why . A lot of people get conned online . 
 Person2:Again , you need to think carefully . If you don't trust others online , have nothing to do with them . 

informal