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 I'll have to borrow it .  
 Person2:Sure you can . But I'm only gonna keep it for a month .  
 Person1:        Why ? It's in mint condition !  
 Person2:That's why I can profit from it !  
 Person1:        You're going to re-sell it on eBay Taiwan ?  
 Person2:You bet . eBay Taiwan doesn't have it ! And bidding will start at two thousand NT . This baby's worth about six thousand to real tennis fans ...  
 Person1:        I've created a monster ... you're a better bayer than me ! 

informal