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:       Hi , Steven ! What do you like to do during the weekend ? 
 Person2:I love swimming and cycling . On Saturday morning I usually ride my bike around the city or the country road for almost two hours . 
 Person1:        That ’ s great ! I think they do you a lot of good . 
 Person2:Sure , they do . 
 Person1:        But why do you choose cycling at first ? 
 Person2:Because it is convenient and good for environmental protection . 
 Person1:        You are really a good citizen . 
 Person2:That ’ s what I can do . 

informal