Definition: 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:  Person1:       If you go out recently you will find some people riding scooters in high streets and back lanes .  
 Person2:Yes . The German engineer would never dreamed that the hand - supported scooter he invented several years ago to solve his traffic problems would become so fashionable in the Occident within a few years and even spread to Japan and China .  
 Person1:        Looking at the ' five sense organs ' of a scooter , it can be said as delicate and agile . To pull the T-shaped pole and make it vertical with the flat board and then pull it vertically , adjust its height suitable to you and you may use it .  
 Person2:Small and exquisite in size , easy to operate , foldable and easy to carry are its charms .  
 Person1:        Your two hands hold the pole , stand on the board , the other foot steps back against the ground and controls well the balance of the body , then you can ride in the air . It has a feeling of surfing . You need not let other people teach you . Your fear will disappear quickly . 

informal