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:       Have you ever been to Britain ? 
 Person2:Oh yes , I ’ Ve been to Britain many times . I go there on business . 
 Person1:        Really ? How often do you go there ? 
 Person2:Usually , I go to London twice a year but sometimes I go three or four times a year . 
 Person1:        Do you always go on business or do you sometimes go for a holiday ? 
 Person2:I ’ m afraid I never go for a holiday . It ’ s always business . 

informal