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:       Get up as early as six o'clock only to be jammed at every crossroad and still late for work . What a life ! I've had enough of it . 
 Person2:Cool down , man . Everyone is fed up with the rush-hour traffic . But life isn't really all that . You should take the initiative and make some changes first . 
 Person1:        What should I do then ? 
 Person2:I recommend you ride a bike instead of commuting by bus . It may offer you many benefits . First , it's good for your health . I'm afraid it's not necessary for me to further elaborate . While lots of people spend time like an hour each morning exercising , a bike ride to work not only builds you up , but also makes full use of time . You might as well sleep out for a longer hour . 
 Person1:        I know cycling is always a more favorable choice than a bus . After all , it's a sport . But do you think it a pleasant experience to take in the dirty , polled air on the road ? 
 Person2:Well , such things are just unavoidable in a great metropolis like Beijing . I think a still more desirable benefit is psychological . Bicycling home after work can help release your stress . Life in the offices is miserable . You just sit there in a daze , gazing at the monitor and dealing with files and documents . Why don't you give a full play to your energy after work ? Enjoy the speed on the road . Just think , you are flashing past the poles with your own energy . How great ! 

informal