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 been served , sir ?  
 Person2:  I am just looking , thank you ... Excuse me . Can you tell me where I can buy a pair of shoes ?  
 Person1:      It's on the fourth floor .  
 Person2:  Thank you . 

1