Instructions: 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, how can I aid you today? 
 customer: Can you please help me to book a flight from LAX to JFK? 
 agent:  Let me know when you are willing to travel to book a flight? 
 customer: Sure, I want to travel on Jan 22 and need to return on Jan 24. 
 agent: Which flight you have preferred to travel either a connecting flight or a direct flight? 
 customer: I need a connecting flight. 
 agent:  If you can help me with your name, I can begin looking up for the availability of flights. 
 customer: I am David Walker. 
 agent: May I know if you prefer to have any other comforts in your journey? 
 customer: I do not have any other specifications. 
 agent: Thank you for waiting and we have found a flight in an economy class with 1 connection in United Airlines and the fare of your flight will be 200. Do you like me to proceed your booking with this flight? 
 customer: Ok, please proceed. 
 agent: Your ticket has been reserved with flight number 1013. 
 customer: Thank you. 
 agent: Thank you for opting us.
Output:
book