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:       I don ’ t understand why you always look so happy , so energetic . It seems like you ’ Ve got good news everyday .  
 Person2:Really ? Do I look happy all the time ?  
 Person1:        All I know is you look quite differently from other teachers .  
 Person2:Oh , do you know why ? Actually , it ’ s easy . Because I always exercise . My exercise , I think , is very hard . I often feel very good after conquering these difficulties . I feel alive !  
 Person1:        Oh , I know . I saw you doing pull-ups one time on the campus and some students trying to imitate you .  
 Person2:Yeah , they are doing it for fun . Seldom would people like my exercise . It ’ s difficult and boring .  
 Person1:        It ’ s true . Many students do the exercise when they have to . We have P . E . once a week .  
 Person2:But I think Chinese students need to exercise more . Besides exercise will help them learn new things better . Don ’ t students want to have a good memory ?  
 Person1:        Of course . I didn ’ t know that . I only know exercise makes bodies stronger . I should take some exercise then . Do you have any suggestions ?  
 Person2:Well , do what you like to do . It can be anything . Jogging , doing aerobics , going bicycling , and playing ping-pong . Absolutely anything . Doing three or more workouts a week is good for you . But remember to do some stretches first .  
 Person1:        Oh , I know . Thank you . 

informal