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:       What book is that ?  
 Person2:I just bought a new atlas . I ’ m looking this map of the world . Look at Russia ! That ’ s a vast country .  
 Person1:        Canada , china , and the use are huge too .  
 Person2:There are several tiny countries in the world too . Countries like Monaco are smaller than many cities .  
 Person1:        Those small countries are microscopic compared to Russia . European countries are relatively small . France looks quite big in Europe , but compared to many countries in other continents , it ’ s not very l  
 Person2:Britain is half the size of france , but great Britain is still one of the largest islands in the world .  
 Person1:        The thing with large countries is that often they have vast areas of land that are useless or hardly used . Russia and Canada have enormous areas of ice and forest . 

formal