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:       You're going to get into a lot of trouble if you do that . 
 Person2:What makes you say that ? 
 Person1:        I don't see anything wrong with what we're doing ! That's just the problem . In these kind of things , the trouble doesn't always appear at first . 
 Person2:But everything has been so easy . 
 Person1:        Everything has gone as smooth as clockwork . Just like we planned ! That may be true , but if you were to do it , you would have trouble on the horizon . You always say that . 
 Person2:Yeah , you never look at the positive side of things . 
 Person1:        Okay . Have it your way , but don't say I didn't warn you . 

formal