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'.

Q: Person1: What do you plan to do for your birthday ?
Person2:I want to have a picnic with my friends , Mum .
Person1: How about a party at home ? That way we can get together and celebrate it .
Person2:OK , Mum . I'll invite my friends home .

A: informal
****
Q: Person1: Anyone home ? Jen !
Person2:I'm in the kitchen ... let yourself in !
Person1: Wow ! You're really working up a storm !
Person2:I know . I've even worked up a sweat .
Person1: You look like a cooking show host--only messier .

A: formal
****
Q: Person1: Where are you going ?
Person2:I'll accompany my wife to the hospital .
Person1: What's wrong with her .
Person2:She is expecting .
Person1: Congratulations to you .
Person2:Thank you .

A:
informal
****