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: Hello , IMPF Bank , how can I help you ?
Person2:I need to report a missing Bank Card and Book .
Person1: OK Sir . Could you tell me the account holder's name , the account number , the amount in the account and your PIN number , please ?
Person2:Well , the account's in my name . Patrick Dean , that's D-E-A-N . The account number is 15273478841 . There was about 20,000 RIB inside .
Person1: OK , Sir . Almost there , I just need your PIN number . When we issue you with a new card and book we would recommend that you change your PIN number . It's a very simple procedure .
Person2:OK , it's 672910 .
answer:
formal

question:
Person1: We're leaving now .
Person2:Here's your bill .
Person1: Right . And would you please forward our mail to this address ?
Person2:Certainly .
Person1: Thank you . Goodbye .
Person2:Goodbye . Hope to see you again .
answer:
informal

question:
Person1: What is that you have there ?
Person2:Aah ! Close your eyes . You aren't supposed to see this .
Person1: Ah ha ! I caught you . Just let me peek . I won't tell anyone .
Person2:You can't peek ! This is a surprise .
Person1: How about one little hint ?
Person2:Here's one little hint . If you don't go out right now , this won't be under the tree .
Person1: That's a very good hint .
Person2:And please shut the door and lock it behind you !
answer:
formal