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 anything to declare ?  
 Person2:  One bottle of perfume and a watch .  
 Person1:      Where did you buy it ?  
 Person2:  In Boston .  
 Person1:      Do you travel a lot ?  
 Person2:  Oh ... I go to see my sister twice a year or so .  
 Person1:      Twice a year ? How long has your sister lived in Boston ?  
 Person2:  Nearly ten years .  
 Person1:      I see , that's a long time . How much was the watch ?  
 Person2:  I can't remember , but I've got the receipt somewhere . Would you like to see it ?  
 Person1:      Yes , I'd like to see the receipt . Oh ! I see you bough the watch last week .  
 Person2:  Yes . Does that mean I'll have to pay duty on it ?  
 Person1:      Yes , I'm afraid you will . Altogether on the watch and the perfume you owe me seven pounds .  
 Person2:  Ok . Here you are . Is that all right now ?  
 Person1:      Yes , that's fine . I hope you enjoyed your stay in Boston ?  
 Person2:  Yes , I did . I had a fine time . 

1