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:       How were things in the Tokyo branch when you were there ? 
 Person2:Good ! They have expanded and are doing better than they were last quarter . It's nice to see some improvement for a change . 
 Person1:        Do you see the trend continuing over the next few months ? 
 Person2:Yes , especially with so many of our executives going back and forth from here to Japan . The only problem is , they may have trouble when they go to open up business here . 
 Person1:        Why would you say that ? 
 Person2:They aren't too familiar with doing business outside of Japan . There are a lot of cultural differences to account for . 
 Person1:        I'll say ! Sometimes they just do things really differently . But one thing I can say , they are really hospitable . 
 Person2:Have you ever been to Japan ? 
 Person1:        Sure ! I just got back yesterday . I'm still suffering from jet lag . 

informal