instruction:
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: I like this shirt.How much is it ?
Person2:$ 135 .
Person1: Wow , that's sheer robbery.Shall I make an offer ?
Person2:I'm sorry , sir.The price is fixed .
answer:
informal

question:
Person1: How may I help you ?
Person2:I want to return this video .
Person1: Is that all you need ?
Person2:I also need to check these books out .
Person1: Anything else ?
Person2:That ' s everything .
Person1: I need your library card .
Person2:I have it . Here you go .
Person1: Do you need anything else ?
Person2:That ' s everything .
Person1: Your books are due back two weeks from today .
Person2:Thank you . Good night .
answer:
formal

question:
Person1: Hello , I bought the pendant in your shop , just before .
Person2:Yes.Thank you very much .
Person1: Now I come back to the hotel and try to show it to my friend , the pendant is broken , I'm afraid .
Person2:Oh , is it ?
Person1: Would you change it to a new one ?
Person2:Yes , certainly.You have the receipt ?
Person1: Yes , I do .
Person2:Then would you kindly come to our shop with the receipt by 10 o'clock ? We will replace it .
Person1: Thank you so much .
answer:
informal