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: Hello. Scott Davis here. 
 agent: Hello, how may I aid you? 
 customer: I want to go Denver for my business purpose. Please check for the flight from MCO to DEN. 
 agent: Sure, please provide the travel dates? 
 customer: My travel dates are from 05/19 to 05/21. 
 agent: I found a flight with price 100 and one connection. 
 customer: That's great. Please go ahead. 
 agent: Ok. Your flight ticket has been confirmed now. 
 customer: Thank you. 
 agent: Thank you.
A:
book