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:     Excuse me . My name is David Walker . Haven't we met before ? 
 Person2:  Well , let me see ... Do you work at IBM Corporation ? 
 Person1:      Yes , I do . 
 Person2:  Now I remember . We met at a conference in Tokyo last year . 

1