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'.

Input: Consider Input: Person1: Hello , can I speak to Alice , please ?
Person2:Hold on , please .
Person1: Thank you .
Person2:Sorry , but she ' s out .
Person1: Could you tell her Tom Green called ?
Person2:I ' d be glad to .

Output: informal

Input: Consider Input: Person1: Kim ! I'm here ! I brought all my old maternity clothes plus Dave and Alice's baby clothes !
Person2:It's a little early for those , isn't it ? I still have eight months to go ...
Person1: Believe me , the time will fly by ! Before you know it , you'll be changing diapers ! You have to start preparing !
Person2:I thought we could turn the upstairs study into a baby room . What do you think about lavender ?
Person1: I'll be back tomorrow with my work clothes and a gallon of lavender paint ! You just sit back and relax !

Output: informal

Input: Consider Input: Person1: I would like to have a custom-made skirt .
Person2:May I take your size ?
Person1: OK . I want it a bit close around the waist .
Person2:No problem .
Person1: How long will it take ?
Person2:About a week .
Person1: What ' s the charge for the tailoring ?
Person2:20 yuan for a skirt .
Output: formal