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:     Hello , Mary . Nice day , isn't it ?  
 Person2:  Yes , what a wonderful day ! The sky has cleared up in the end .  
 Person1:      I do feel like an outdoor exercise . After all , we haven't had such a beautiful day for a long time .  
 Person2:  How about taking a walk in the park ?  
 Person1:      OK . It's delightful to have a walk in the park with the air so fresh .  
 Person2:  ( After they entering the park ) Great , it's so quiet here . We have the park to ourselves , only you and me .  
 Person1:      Are you kidding ? Don't you see many people over there ? Just on your right .  
 Person2:  Oh , I see them . Beautiful weather should be shared by all the people .  
 Person1:      Ah , you changed so fast . 

1