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'.
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Question: Person1: Good to see you . Come on in .
Person2:Thank you . Here's a present for you .
Person1: Oh , you shouldn't . But thank you very much .

Answer: informal

Question: Person1: Your knowledge of English is really surprising .
Person2:Oh , it's nothing to speak of .
Person1: No , seriously . I am impressed .
Person2:Thank you . I appreciate the compliment .
Person1: Your knowledge of English is really surprising .
Person2:Oh , it's nothing to speak of .
Person1: No , seriously . I am impressed .
Person2:Thank you . I appreciate the compliment .

Answer: informal

Question: Person1: Today more and more families have personal computers . People have wider range of choice to communicate with the outside world .
Person2:Right . With the establishment of Internet and a lot of web companies , people are getting more and more dependent on the web .
Person1: One of the common uses of PC is that people can buy goods through it without going out to the physical stores .
Person2:Can you tell me how it is done ?
Person1: If a customer is interested in some certain goods , he can ask the web company to have the specimen of the goods shown on the color screen , and then the customer can place an order online to the sales company . And then the goods you want will be delivered to your home . The service is perfect and the delivery is free of charge .
Person2:I see . So great .

Answer:
informal