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 Q]: Person1: Thanks for the pizza . It was delicious .
Person2:It's okay .
Person1: Next time , it's on me .
Person2:Don't be silly .
Person1: I'm serious .
Person2:Alright . Next time , we can try some other flavors .
Person1: Certainly . The vegetarian pizza looks pretty good . It must be very delicious .
Person2:Definitely . I really like Italian food .
[EX A]: informal

[EX Q]: Person1: Welcome , sir , what can I do for you ?
Person2:I want to buy some records .
Person1: Whose record do you want ?
Person2:Are there the records of Michael Jackson ?
Person1: His records have been sold out . The new copies will be available next week .
Person2:Oh . it's too late . Maybe I should go to other video stores to have a look .
[EX A]: formal

[EX Q]: Person1: Who's singing in your home , Jim ?
Person2:It's Ellie and her friends .
Person1: Who's Ellie ?
Person2:She's my little niece.It ' s her birthday.They ' re singing " Happy Birthday " .
Person1: Oh , I see.how old is she ?
Person2:She's ten .
Person1: I suppose they're playing games .
Person2:Oh , yes.Ellie was playing games all day yesterday.By the way , Alice , when's your birthday ?
Person1: Today .
Person2:Today ?
Person1: Yes .
Person2:Well , imagine that ! How old are you ?
Person1: Eighteen.Some friends are having a birthday party for me tonight.Do you want to come ?
Person2:Very much.What time ?
Person1: About 6:00 .
Person2:I'll be at your house at about 5:30 . Happy birthday .
[EX A]:
informal