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 help you? 
 customer: I am Ruth Garcia want to visit LAS, can you book a ticket from AUS? 
 agent: Sure, please provide your itinerary dates. 
 customer: Sure, my travelling dates will be 03/21 and 03/23. 
 agent: Please give me a moment to check for available flights. 
 customer: Ok. 
 agent: Southwest airlines with flight 1026 is providing service on your route with a connecting flight. 
 customer: That's ok, thank you. Proceed with my booking. 
 agent: Your ticket is reserved. 
 customer: Thank you. 
 agent: Thank you for choosing us.
A:
book