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 I've had a terrible row with my boss . What shall I do ? 
 Person2:I think you'd better apologize . 
 Person1:        Oh , but I can't . It wasn't my fault . 
 Person2:Maybe not , but I advice you to say it was your fault . 

formal