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:     Did your eye doctor prescribe you contact lenses ? 
 Person2:  No , I ’ d like to know something about contact lenses . 
 Person1:      Oh , I see . We have both hard and soft contact lenses . They are very popular , but a little more expensive than ordinary glasses . 
 Person2:  I have found I ’ m short-sighted recently . I need to wear glasses . As a student , it ’ s better for me to wear ordinary glasses instead of contact lenses . 
 Person1:      We have many kinds of glasses here . Which frames do you like best ? 
 Person2:  I think the square-shaped ones will be the best for me . 
 Person1:      What about this pair ? They are the ' in ' things now in optical wear . Try them on . 
 Person2:  They fit me very well . I like them . 
 Person1:      Please go to receive optometry first over there . 

1