You will be given a definition of a task first, then some input of the task.
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

customer: Hello. 
 agent: Hello. How may I assist you at this moment? 
 customer: Can you please help me in booking a flight ticket from EWR to DFW? 
 agent: Sure, I am happy to help you with that. May I know your travelling dates, please? 
 customer: Sure, my travel dates are from Aug 26 to Aug 28. 
 agent: Do you have any connection limit for your flight? 
 customer: I would prefer connecting flight. 
 agent: May I know your other requirements for your journey? 
 customer: No more specifications. 
 agent: Let me know your name to proceed further for documentation purpose. 
 customer: Myself Donna Jackson. 
 agent: Delta airlines is providing you the connecting flight in economy class, shall I reserve it? 
 customer: Ok, please reserve it. 
 agent: Your ticket has been reserved with flight 1003. 
 customer: Thank you for booking. 
 agent: Thank you for choosing us.
Output:
book