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:       What type of movies do you like ? 
 Person2:I like all sorts of movies , primarily drama and science fiction . 
 Person1:        That's an interesting combination . How about western movies ? 
 Person2:Western and horror are the two types of movies I don't care for . 
 Person1:        Why don't you like horror ? They're entertaining . 
 Person2:Some are entertaining , but I find most of them stupid and childish . For example , I don't understand why a person always goes into the house alone when something is suspicious . 
 Person1:        Ha ha . I know what you mean . But it's just a movie . They need for the characters to do that . 

informal