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:     S :: Welcome to Flash Foto.What can I do for you , ma ’ am ?  
 Person2:  C :: I ’ d like to have this roll of film developed .  
 Person1:      S :: What size prints would you like ?  
 Person2:  C :: Four by six will do .  
 Person1:      S :: All right , ma ’ am , they ’ ll be ready for you in an hour . 

1