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 am fed up with Jack . He is so weak in dealing with other people and always eats dirt .  
 Person2:So he is . But , why not try to help him to become stronger ?  
 Person1:        How do you know that I didn ’ t try ? I just couldn ’ t manage it . 

informal