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:       Ms . : Do you have a question , Mary ?  
 Person2:No . That's not why I raised my hand . I need to go to the ladies ' room .  
 Person1:        Ms . : Let me give you a hall pass for it .  
 Person2:What's a hall pass ?  
 Person1:        Ms . : With a hall pass , you can go to the ladies ' room or wherever you need to go during class time .  
 Person2:I see .  
 Person1:        Ms . : If a teacher stops you in the hallway , just show him or her the pass .  
 Person2:Or else I'll get into trouble .  
 Person1:        Ms . : That's right . 

formal