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:       What's wrong ? You don't like ancient Egypt ?  
 Person2:Actually , I don't like history . Lately , these shows are always about the Pyramids .  
 Person1:        The Pyramids are amazing ! Millions of gigantic stones ... each one perfect ...  
 Person2:And nobody knows who built them , right ? It's a total mystery !  
 Person1:        You sound like the TV ! You're not going to tell me that aliens built the Pyramids , are you ? 

formal