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:       Are you interested in history ? 
 Person2:Yes , I am . I enjoyed studying it at school , though I had trouble remembering all the dates , so my teacher never gave me good marks . 
 Person1:        I love history , but I ’ Ve always thought that learning the reasons behind events is more important than remembering exactly when they happened . 
 Person2:I wish you had been my history teacher ! I might have got better marks ! 
 Person1:        Some people say that history repeats itself . 
 Person2:What does that mean ? The same events never happen twice , do they ? 
 Person1:        The idea is that the people and dates change , but the reason why things happen stay the same . 
 Person2:I see . I think I ’ d agree with that statement . People often seem to make the same mistakes over and over again . 

formal