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:       Then , Mary . We need 10 more loose-leaf binders , five pounds of heavy duty white paper , and what else did I say ?  
 Person2:Two boxes of transparencies for the over-head machines .  
 Person1:        Right . And I ’ d like one of those new electric pencil sharpeners .  
 Person2:All right , Mr . Jones . Do you think we ’ ll need anything else ? 

formal