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 Christine Davis. 
 agent: Hello, how can I assist you? 
 customer: I am planning to participate in pioneer festivals in DCA, can you please help me to book a flight ticket from HOU? 
 agent: Sure, let me know your travelling dates? 
 customer: My journey dates are 01/17 to 01/19. 
 agent: Please provide your specifications. 
 customer: I need a halt. And my price is 5000. 
 agent: Southwest airlines with single connection and price is 100 of 1001 flight. 
 customer: Ok, book the ticket. 
 agent: Your ticket has been confirmed. 
 customer: Thanks for your help. 
 agent: Thank you.
Output:
book