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:     Hello , is that Cathy speaking ? 
 Person2:  Yes , is that you , Allen ? 
 Person1:      Yes , how are you doing ? 
 Person2:  Not bad . 
 Person1:      Say I've got two tickets for the concert this evening.Would you like to come with me ? 
 Person2:  Sure.Thank you very much . 
 Person1:      Then I ' ll pick you up at six thirty.OK ? 
 Person2:  Ok , see you . 
 Person1:      See you . 

1