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:       We ’ Ve been over this a thousand times . The data is irrefutable ! Look , we ’ Ve done extensive research , built studies , and read the literature , and there is conclusive evidence to support my theory ! 
 Person2:Horowitz , I beg to differ . Even in your most recent study , the investigative approach was flawed ! You know as well as I do that the collection of data was not systematic , and there is a large margin of error . To draw a definitive conclusion based on that data would be misleading 
 Person1:        That is preposterous ! 
 Person2:You are trying to single-handedly solve one of the world ’ s greatest mysteries , and yet you are oblivious to the fact that you are wrong ! 
 Person1:        I am not wrong ! The chicken came first ! 
 Person2:No ! The egg came first ! 

informal