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:       So what did you think about the movie ? 
 Person2:Well , I think this Star Wars episode is an excellent piece of work , but not as good as the previous ones . 
 Person1:        Really ? I don't agree . This Star Wars episode was incredible ! 
 Person2:Why do you think so ? 
 Person1:        Well , one of the most spectacular things about this one was the special effects . State of the art special effects are the main reason for the success of previous episodes , so audiences have high expectations for this one , and I don't think they will be disappointed . 
 Person2:You are right . The special effects were amazing . And I like the fact that they created so many fantastic settings and otherworldly costumes , weapons and creatures . 
 Person1:        It's kind of cool that they are still using the same Star Wars theme song for this movie . 
 Person2:Yeah ! It reminds me of the previous Star Wars scenes . 
 Person1:        I know exactly what you mean . Hearing that song gives me a nostalgic feeling . 
 Person2:I thought the overall plot of the movie was very interesting , but I don't think the character development was that strong . 
 Person1:        Do you think that they had anything to do with the casting of the movie ? 
 Person2:No , the casting is great and the actors were excellent . They just didn ’ t have a lot of funny or meaningful dialogues . The writing was also a little weak . 
 Person1:        Well , maybe . But I like the little kid who played Manakin Skywalker . I can't imagine anyone else playing that role . 
 Person2:I liked him too . He is so cute ! You know , even though I was slightly disappointed , I can't wait for the next episode . I wonder when they ’ re going to start making it and when it ’ s scheduled for release ? 
 Person1:        I've no idea . But looking at the success of Star Wars episode , I've a strong feeling production for the next episode will be selling pretty soon . I hope It will be even better than this one . 
 Person2:I hope so , too . 
 Person1:        Well , I think we should go now . It's getting pretty late . 
 Person2:Okay , let's go ! 

informal