Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. If the conversation begins with a question, label it '1' otherwise '0'.
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 . 

1