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:     Switchboard . Which extension would you like ?  
 Person2:  Extension 1616 , please .  
 Person1:      I'm afraid the line is busy at the moment . Just hold on , please .  
 Person2:  Then , will you try extension 235 ?  
 Person1:      Certainty , sir . 

1