Detailed Instructions: 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
Q: customer: Hi. 
 agent: Hello, how may I render you at this moment? 
 customer: I am Jennifer Wright planning to have a round trip from AUS, can you help me in booking my flight ticket? 
 agent: Sure, I will help you. Can I have your travelling dates please? 
 customer: Sure, my travelling dates will be 04/10 and 04/12. 
 agent: May I have your source and destination airport codes respectively? 
 customer: Sure, as it is a round trip I would like to choose my source and destination as AUS. 
 agent: May I have a moment please? I will check for the flights scheduled towards your destination. 
 customer: Sure. 
 agent: Thank you for waiting Wright. There is a flight available with 1 connection and airline is Southwest, shall I book it? 
 customer: Yes, you can proceed with this airline. 
 agent: Your booking is done with flight number 1011. Happy journey. 
 customer: Thank you for your service. 
 agent: You are welcome. Thank you for reaching us, have a nice day.
A:
book