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:       So what are you doing for Thanksgiving ?  
 Person2:Not much really . It's more of an American tradition , so back home we don't really celebrate it . In fact , I am not even sure of what exactly is being celebrated !  
 Person1:        Well you know , it's a time to get together with all your family and be thankful for everything !  
 Person2:Yeah but , how did this holiday come to be ?  
 Person1:        Well , the first settlers of Massachusetts arrived there because of religious persecution from England and King James . Once in the New World , they befriended an native named Squanto , who taught them how to harvest food from the area such as corn .  
 Person2:And then what did happen ?  
 Person1:        Well , they had enough harvests for the next winter and celebration 。 They decided to have a big feast for the natives , giving thanks the land , and everyone for the foods , healthy and new lives .  
 Person2:Interesting ! I am amazed how big and delicious thanksgiving dinners are !  
 Person1:        Come to my house for Thanksgiving ! We are having turkey , pumpkin pie , mashed potatoes with gravy , and lots of stuffing !  
 Person2:Count me in ! 

informal