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:     This is frank speaking , may i ask who is calling ?  
 Person2:  This is Jane , I'd like to speak to Mr.Wang , please .  
 Person1:      I'm sorry , he is not here at the moment . He has gone to the International Business Center .  
 Person2:  When do you expect him back ?  
 Person1:      I'm not sure , he didn't say when he wound return . If you'd like.you can leave him a message until he is back to you until the moment it's free .  
 Person2:  Yes , thank you . When he gets back , please just let him know that jane called . And i need him to call me back .  
 Person1:      Does he have your number ?  
 Person2:  Yes , he does . But i give it to you again . 5264453 6  
 Person1:      That was 5264453 6 , right ?  
 Person2:  Yes , thank you very much .  
 Person1:      You are welcome . 

1