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 can I serve you today? 
 customer: My name is Scott Davis, I want to book a connecting flight to Houston city for short vacation. Can you book a flight with in fare of 500? 
 agent: Ok, Scott Davis. May I know your source and destination codes? 
 customer: My source point is NY-JFK and my destination is TX-IAH. 
 agent: Can you please share your trip dates to book a flight ticket? 
 customer: I will fly on 03/09 and return on 03/11. 
 agent: Do you need any halt? 
 customer: Yes, I need a halt. 
 agent: Thanks for your details, please wait for a while. 
 customer: Sure. 
 agent: We found a connecting flight with an airline AA and flight number 1022. Shall I reserve it? 
 customer: Please proceed with booking. 
 agent: Your ticket has been confirmed with fare of 200. 
 customer: Thank you for helping me. 
 agent: Thank you for approaching us.
Output:
book