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 are you and Corey doing for Valentine ’ s Day this Friday ? 
 Person2:Probably nothing . 
 Person1:        You have to do something romantic . 
 Person2:Romantic ? I can't remember what that word means . 
 Person1:        Well , you have three kids , so you knew what it meant once upon a time ! 
 Person2:Ha , ha ! Those days are long gone . 

informal