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: Hey , let's arm wrestle !
Person2:Not now .
Person1: Chicken ! You're afraid I'll beat you .
Person2:Are you kidding ? I just feel tired right now .
answer:
informal

question:
Person1: That girl looks very attractive , doesn ' t she ?
Person2:Do you think so ? I don ' t like girls who look like that . I like girls who aren ' t too slim . If you like her , go and talk to her .
Person1: I ' d like to , but there ' s her boyfriend . He ' s very broad-shouldered .
Person2:He ' s huge ! He must go to the gym to have a well-built body like that .
Person1: Do you prefer tall girls or short ones ?
Person2:I don ' t mind , but I like girls with long hair .
Person1: We have different tastes . I like girls with short hair . I like tall girls - probably because I ' m so tall myself .
Person2:Have you ever dated a girl taller than you ?
Person1: No , never . I don ' t think I ' Ve ever met a girl taller than me ! Have you gained weight recently ?
Person2:Yes , I have . Perhaps I should go to the gym , like that girl ' s boyfriend .
Person1: I'm getting a bit plump myself . Perhaps I ' ll go with you .
answer:
formal

question:
Person1: Hello , this is Helen speaking .
Person2:Hello , Helen . This is John . How are you ?
Person1: Fine , thank you . And you ?
Person2:Fine , thanks . I ' ll have a party next Sunday at home . I ' m calling to ask whether you can come or not .
Person1: Oh , how wonderful . I ' ll be glad to .
Person2:Okay , now you are a famous star .
Person1: Hum , don ' t say that . Maybe you can do something useful for me .
Person2:What ' s wrong with you ?
Person1: I ' ll tell you at the party .
Person2:Okay .
answer:
informal