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:       Is your city a historical place ?  
 Person2:Not rally . 200 years ago , it was just a small insignificant village .  
 Person1:        How did it grow into such a large place ?  
 Person2:Large deposits of coal were found nearly and so many industries located themselves here . The village quickly grew into a key industrial centre .  
 Person1:        As the city grew , it must have absorbed many village nearby .  
 Person2:Yes , it did . The names of those village survive as the names of parts of the city .  
 Person1:        I see . Are there any building more than 200 years old in your city ?  
 Person2:Oh , yes . Several of the buildings from the villages still survive . Many of them were inns for travelers and today survive as pubs . There was a castle near one village , so our city has a castle too .  
 Person1:        Really ? So your city does have some old history after all . 

informal