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 didn't ring me last night . You said you would .  
 Person2:I'm sorry to have made you disappointed .  
 Person1:        That's all right . But why were you so rude to me at lunch .  
 Person2:Was I ? Sorry , I didn ’ t mean to be . I do apologize .  
 Person1:        And why are you yarning now ? Are you bored ?  
 Person2:Forgive me darling . I'm very tired . 

informal