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:       Wow ! I can't believe I'm standing here !  
 Person2:What are you so excited about ?  
 Person1:        I'm standing in front of an exquisite work of art !  
 Person2:What's the big deal ? It's just a picture of some woman .  
 Person1:        I've seen it so many times in books , but I never imagined I'd get to see it in person .  
 Person2:There are tons of other paintings that I think are better .  
 Person1:        Maybe so , but do you have any idea how much this one is worth ?  
 Person2:No , how much is it worth ?  
 Person1:        About 80 million dollars .  
 Person2:Whoa . 

informal