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'.
--------
Question: Person1: Who did the stupid thing ?
Person2:Maybe it was Dick .
Person1: I don't think so . Dick has been on the ball and never does things like that .
Person2:Then it must be a naughty boy who did it .

Answer: formal

Question: Person1: Is there a vacant table for two now ?
Person2:Yes , sir , let me show you the table . This way please .
Person1: Well , we would like to sit over there . Is that all right ?
Person2:Of course .

Answer: formal

Question: Person1: Susan has got married .
Person2:Really ? How do you know that ?
Person1: Her marriage was a hole and corner affair .
Person2:Why ? That ' s good news , but no one knows it ?
Person1: I have no idea . Maybe she didn ' t want to let us ... , so ...

Answer:
informal