Teacher:In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: `book`: Make a new reservation, `cancel`: Cancel an existing reservation, `no_flight`: No flight found for the customer's preference, `no_reservation`: No reservation / No change / No cancellation was made in the conversation, mostly enquiring details
Teacher: Now, understand the problem? Solve this instance: customer: Hello. 
 agent: Hello, how can I aid you? 
 customer: I have planned to visit DFW from JFK, please assist me in booking. 
 agent: Sure, can you share your trip dates? 
 customer: My preferred dates are Mar 10th and return Mar 12th. 
 agent: Do you have any preferences? 
 customer: Yes, I need economy class. 
 agent: May I know your name? 
 customer: Barbara Martinez. 
 agent: There is a connecting flight with number 1002 in airline Spirit, the fare is 100 in economy class. Can I book it? 
 customer: Proceed. 
 agent: Your ticket is reserved, the depart time is 23:00 hours and return time is 13:00 hours. 
 customer: Thank you for booking. 
 agent: Thank you for opting us.
Student:
book