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:     May , is this the Hall of Ancient China ?  
 Person2:  Yes . Look at these historical relics here , amazing !  
 Person1:      Why are they all in glass boxes ?  
 Person2:  For protection . Some relics will turn to dust if exposed to air .  
 Person1:      So there isn't air in the glass boxes ?  
 Person2:  No , there isn't . There is a vacuum in every box .  
 Person1:      I wonder how old these things are . Thousands of years ?  
 Person2:  Yeah , they all come from a very ancient time .  
 Person1:      Hey , look at the tripod . I've seen it on TV .  
 Person2:  It was made 4,000 years ago . It's priceless ! 

1