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:     The Johnson are on their way back . You remember them , don't you ?  
 Person2:  Johnson ? I can't place them .  
 Person1:      We met them in Bermuda last May .  
 Person2:  They've completely slipped my mind .  
 Person1:      The couple with the dogs-think back .  
 Person2:  No , I don't recall a thing about them .  
 Person1:      Well , I've invited them for brunch .  
 Person2:  Hmm , I must be getting absent-minded . 

1