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:     How much is the postage for this postcard to China ? 
 Person2:  How would you like to send it ? 
 Person1:      By airmail . 
 Person2:  Sixty cents please . 
 Person1:      Here you are . 
 Person2:  Please write down the zip code in the mailing address . 
 Person1:      Oh , one more thing , I want to send the card by registered mail too . 
 Person2:  OK . please give me twenty cents . 
 Person1:      Here it is . and thank you very much . 
 Person2:  You're welcome . 

1