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:     How are you tonight , sir ?  
 Person2:  Oh , not too bad . I'm just glad the weekend's finally here .  
 Person1:      I know what you mean . What can I get for you ?  
 Person2:  Give me a screwdriver on the rocks .  
 Person1:      One screwdriver , coming right up . ( He mixes the drink . ) Here you are , sir .  
 Person2:  Thanks . 

1