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'.

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