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:       Jane ! What an enchanting skirt you have on ! 
 Person2:Thank you ! Guess how much it costs . 
 Person1:        Bright colors , smooth material , exquisite craftsmanship , soft lines ... Darling , it looks elegant on you ! It can't be any cheap stuff . Something around two hundred , I guess . 
 Person2:Your offer is way off the mark . It set me back only sixty-five . 
 Person1:        Then you got a windfall ! Was sixty-five the original price , or did you get a special discount ? 
 Person2:Neither . I drove a hard bargain with the vendor before I got the price down . 
 Person1:        How much did she ask for ? 
 Person2:Three hundred ! That's daylight robbery . How dare she play tricks on an old hand like me ? Without hesitation , I gave my offer---no more than fifty . 
 Person1:        She must be fuming with anger at such a bid , wasn't she ? 
 Person2:Not at all ! She's really been around , and seemed quite accustomed to bargaining like this . That's the trade . She only demanded a higher bid , saying the purchase price was even higher than seventy . She was lying ! Then I inquired , ' May I have it at sixty ? ' she waved her head . 
 Person1:        Then you pretended to go without buying it ? 
 Person2:Yeah . I turned around and started to move out . Just then , she yelped behind my back , ' all right , all right ! I may sacrifice a little . Let's fix it sixty-five ! Can't be cheaper . ' 

informal