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:       It will do you good to go out for entertainment at weekends.What kind of movie do you like best ? 
 Person2:It's hard to say , I like interesting and significant ones . I don't care whether they're blockbusters or not . 
 Person1:        Shall we go downtown for a movie this Friday evening ? 
 Person2:Very good , What's on ? 
 Person1:        I'm not sure . Let me give a call to find out . 

informal