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'.

Example Input: Person1: Would you like me to fill out the form ?
Person2:I suppose so , but don't rush . I've got to tell you how to do it .
Person1: That's very kind of you .
Example Output: informal

Example Input: Person1: Hi ! Dick . Where are you going ? You're in such a hurry .
Person2:Playground . We're having sports for today's outside class activities . All my classmates have already got there .
Person1: What are you going to play ?
Person2:Some of us will play basketball and some volleyball .
Person1: Enjoy yourself .
Example Output: informal

Example Input: Person1: Good morning . Sanyu Restaurant . May I help you ?
Person2:What time do you open this evening ?
Person1: We open at 6:30 , sir .
Person2:I see . I'd like to reserve a table for two .
Person1: Yes , sir . What time would you like your table , sir ?
Person2:I'm not sure , perhaps around 8 pm .
Person1: Fine ! I'll reserve a table for two at 8 pm , sir . May I have your name , please ?
Person2:Davis .
Person1: Thank you , Mr . Davis .
Person2:Oh , any chance of a table by the window ? My wife loves the bird's eye view . As it's her birthday , I want it to be a celebration .
Person1: I see . We have already received many bookings and though I can't guarantee anything , please be assured that we'll try our best , Mr . Davis . I hope you'll understand .
Person2:I do , but I would appreciate you , if it could be arranged .
Person1: We'll try our best .
Person2:Thank you .
Example Output:
informal