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:       When would you like me to send those plans over to your office , Mr . Montgomery ?  
 Person2:It would be good if you could get them to me by Thursday afternoon , Ms . Barkley .  
 Person1:        That shouldn ’ t be a problem . What is the exact address , again ?  
 Person2:7880 Crofton Avenue , Building 40A , Room 304 . 

formal