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:       Do you do morning exercises ? 
 Person2:Yes . I do one set of shadow-boxing every morning after I get up . 
 Person1:        Shadow-boxing ? How interesting ! Do you think it really helpful for your health ? 
 Person2:Definitely . It not only keeps me fit but also helps me concentrate on my soul . 

informal