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 don ’ t know why bucks have such a great charm that a great many people are after nothing else . 
 Person2:They want to be filthy with dough and think it the only source of their happiness . 
 Person1:        But many rich guys don ’ t think they are truly happy . There is always some empty feeling deep inside them . 

informal