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:       I'm afraid we can't increase salary this year , money is just too tight .  
 Person2:I'm not sure . I can't agree , dan .  
 Person1:        Why not ?  
 Person2:Surely , there are other ways to save money .  
 Person1:        What are you talking about , we've tried everything ! 

informal