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, how may I aid you? 
 customer: I am Kevin Parker, I need to book a flight ticket from TX-DFW to CO-DEN. 
 agent: Sure, may I know your travelling dates? 
 customer: I want to fly on 09/21 to meet my cousin and return on 09/23. 
 agent: Do you need any stopover in between your journey? 
 customer: I need a stop over in between the journey. 
 agent: We found a flight with number 1004 and Spirit as airlin. The cost of the ticket is 200. 
 customer: You can proceed with booking. 
 agent: Your ticket is booked. 
 customer: Thank you for your help. 
 agent: Thanks for reaching us.
A:
book