Q: 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?
customer: I am William Anderson. I need to visit Lyndon Baines Johnson library at Austin. Can you book me a flight ticket?
agent: Sure, I will help you in that.
customer: Thank you.
agent: When did you planned to visit Lyndon Baines Johnson library?
customer: I want to travel on 04/18, and need to catch return flight on 04/20.
agent: Thanks for providing your dates we need some more details also, please share me your airport codes?
customer: I need to leave from my nearest airport HOU to reach AUS.
agent: We found a flight on your details with airline Spirit, flight number: 1026. Shall I book this ticket with economy flight?
customer: Proceed with the booking.
agent: Your ticket has been booked.
customer: Thanks for the help.
agent: Thank you so much.
A:
book