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: He has so many friends supporting him .
Person2:And he himself is very diligent . Considering all these , I think he has the ball at his feet .
Person1: But he has to stick to it and to it long enough .
answer:
informal

question:
Person1: Hi , I want to see the Terra Cotta Warriors in Xi'an . Could you please remind me when we are arriving at that stop ?
Person2:Oh . You took the wrong bus . You need to take Bus 151 which goes the opposite direction .
Person1: Oh , no ! What should I do now ?
Person2:Don't worry . You can get off at the next stop and walk across the street and take the Bus 151 to the opposite direction .
Person1: Ok . How many stops do I have to go ?
Person2:About 15 stops .
Person1: That is a long way to go . It is so kind of you to help me . Thank you very much .
Person2:My pleasure .
answer:
informal

question:
Person1: Hello , Julia , I know a party that will begin at midnight . Would you love to go ?
Person2:I'd love to , but my mother asks me to go home before 11:00 every night . She will worry if I get home late .
Person1: What a pity ! The party is very interesting .
Person2:I have no choice . My mother is always very strict with me .
Person1: Don ' t complain about it . She is concerned about your safety .
Person2:You're right . Mother's love is the greatest love in the world .
answer:
informal