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,. I am Jason Hall. 
 agent: Hello, how can I serve you today? 
 customer: Can you please book a flight ticket from Oakland, OAK to Houston, HOU? 
 agent: Sure, I can book a ticket for you. 
 customer: Thank you. 
 agent: May I know your planned travel dates? 
 customer: My journey dates are, depart on 12/28 and return back on 12/30. 
 agent: Hawaiian airline plane is available for you with a fare of 200, are you ok with this flight? 
 customer: Ok, proceed with the booking. 
 agent: Ok, your booking has been confirmed with 1011 flight. 
 customer: Thanks for your service. 
 agent: Thanks for approaching us, have a nice day.
Output:
book