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. 
 customer: I am Thomas Moore. 
 agent: How can I assist you today? 
 customer: Please book me a ticket from AUS to HOU to meet my family. 
 agent: Sure, will you mention your travelling dates please? 
 customer: My travelling dates are from 07/26 to 07/28. 
 agent: Please give me a moment. 
 customer: Ok. 
 agent: Thanks for waiting, there is a flight with price 100 and the connections 0 is available. Shall I confirm your ticket? 
 customer: Ok, please book this ticket. 
 agent: Your ticket is booked. The flight number is 1004 and the airline is AA. 
 customer: Thank you. 
 agent: Welcome, have a great day.
A:
book