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 band is pretty good . How do you like the music ?  
 Person2:  It's very nice . I haven't heard live music in a while . This is fun .  
 Person1:      Well , then , may I invite you for the next dance ?  
 Person2:  Of course . But I'm afraid I'm not much of a dancer ...  
 Person1:      Don't worry . I'm not much of a dancer myself .  
 Person2:  You're dancing so well .  
 Person1:      You dance beautifully too .  
 Person2:  When did you learn to dance ?  
 Person1:      In college . But I don't dance very often . What's your favourite dance ?  
 Person2:  It's hard to say . It depends . But I love the waltz .  
 Person1:      How about tango ?  
 Person2:  Oh , I like it . It's such a beautiful dance , but I can't do it well . What about you ?  
 Person1:      Tango is my favorite . Anything but hip-hop or the foxtrot . ( the music has stopped )  
 Person2:  Thank you for the dance .  
 Person1:      My pleasure . Let's go and have a drink .  
 Person2:  OK . 

1