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'.

Ex Input:
Person1: Nice and warm again , isn ' t it ?
Person2:Oh , it ' s lovely . Think of the nasty weather we had last week .
Person1: How are you these days ?
Person2:Fine , thank you . And you ?
Person1: Fine today , though a bit under the weather last week .

Ex Output:
informal

Ex Input:
Person1: Is there anything I can do for you ?
Person2:Yes . I've received this Remittance Advice from the bank .
Person1: Could I take a look at it , please ? Let me just check these details ... right .
Person2:Mr CK Chen contacted me this morning and asked me to come in for the remittance .
Person1: I've got the details here . 10,000 RIB sent by Mr CK Chen from Guangzhou . Could I see some ID ? You passport , for example ?
Person2:Here you go . Can I deposit some into my account and take some in cash ? I need 1,000 RIB for my expenses , you see .
Person1: That's no problem . Could you please sign here ? Here's the 1,000 RIB in cash , your passport back , and the remaining balance has been deposited in your account .

Ex Output:
formal

Ex Input:
Person1: Hi , Tony . You look unhappy . What's wrong ?
Person2:Oh , Steven , I made a big mistake .
Person1: What happened ?
Person2:I really wish I hadn ' t done it .
Person1: What on earth are you talking about ?
Person2:I got caught cheating . I feel so ashamed . The teacher saw me and told me I failed .
Person1: What were you thinking ?
Person2:You know my father . If I fail , he'll kill me . I have to do well .
Person1: But what you should do is study hard .
Person2:I know ... I know ... it's all my fault . I feel awful that I didn ' t study , and I cheated , and I got caught .
Person1: So long as you learn from your mistakes .

Ex Output:
informal