Definition: 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
Input: customer: Hello. 
 agent: Hello. 
 customer: I am Barbara Clark. 
 agent: How can I help you? 
 customer: I want to have a reservation with the flight to Las Vegas which is rich for it's arts and culture. So, I am willing to have a trip in the month of March. Can you please help me in booking my flight ticket from Washington? 
 agent: Sure, may I know your airport codes please? 
 customer: Thank you for reacting positively. My airport codes are DCA and LAS respectively. 
 agent: May I know your travel dates please? 
 customer: Sure, my travel dates are 03/13 and 03/15. 
 agent: There is a flight with single connection, can I proceed for booking in Jet blue airlines? 
 customer: Yes, do proceed with the booking. 
 agent: Your booking is done in 1014 flight. 
 customer: Thank you for booking my flight ticket with the JetBlue airlines. 
 agent: Thank you for choosing us.
Output:
book