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. I am Matthew Jackson. 
 agent: Hello, how may I render you today? 
 customer: I need to attend a workshop in Smithsonian Institution at Washington, DCA. Can you help me in my booking? 
 agent: Sure, we are happy to help you. 
 customer: Thank you. 
 agent: Can you please let me know your boarding point? 
 customer: My source airport code is Denver, CO - DEN. 
 agent: Do you prefer any way station in between journey? 
 customer: Yes, I need a halt in my journey. 
 agent: When you are planning to make your journey? 
 customer: I want to start my journey on 10/14. I want to return on 10/16. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: We found a Frontier airline, flight number 1018 and the fare of 100 with single stopover. 
 customer: Proceed with my booking. 
 agent: Your ticket has been reserved. 
 customer: Thank you for your help. 
 agent: Thank you for choosing us. Have a safe journey.
A:
book