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:     what do you think about all the different diets people go on ?  
 Person2:  I don't think dieting is good for you . It's much better to eat a balanced diet and to never get overweight to begin with !  
 Person1:      but what do you think about people who are obese ? What should they do to lose weight ?  
 Person2:  they need to eat healthy foods , but they also have to increase the amount of exercise they do every day . They don't have to cut out fattening foods altogether , though .  
 Person1:      so you think it's ok for people who are dieting to eat chocolate ?  
 Person2:  sure , they can eat some chocolate . As long as they are exercising and eating mostly healthy foods , there's nothing wrong with having a small desert .  
 Person1:      how about drinking soda ?  
 Person2:  many people gain weight by drinking far too much soda . Soda should be a treat ; there's simply no nutritional value in it whatsoever . If you want to lose weight and you can't stop drinking soda , try  
 Person1:      that's good advice . Have you ever tried taking vitamins ?  
 Person2:  my mother used to make me take vitamins every day , but I don't take them anymore . Vitamins are good as a supplement , but they don't do much good if you don't have a well-balanced diet to start .  
 Person1:      how do you know so much about food and dieting ?  
 Person2:  you might not believe this , but I used to be twice the size than I am now ! 

1