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
Input: customer: Hello, I am Alexander Anderson. 
 agent: Hello, How exactly I can serve you the best today? 
 customer: Please book a ticket to TX - AUS, Austin, with a connecting flight. As I need to attend citizenship day celebration with my neighbours. 
 agent:  Sure, we are perky to serve you. 
 customer: Thank you. 
 agent: Can you please provide your take off airport code? 
 customer: Seattle, WA - SEA. 
 agent: Could you let me know when you are willing to travel? 
 customer: On 12/28, I will start. 
 agent: Let me know your return date? 
 customer: And I will return on 12/30. 
 agent: Ok, wait for a while I will check the availability of flights and revert you. 
 customer: Sure. 
 agent:  Thanks for your precious time. We found AA airline fare of 100. Shall I proceed for booking with single stop over flight? 
 customer: Yes, please proceed for booking. 
 agent: Your ticket has been reserved with flight number 1025. 
 customer: Thank you for your service. 
 agent: Thank you for availing us, Have a safe journey!.
Output:
book