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. 
 agent: Hello, how may I help you? 
 customer: Richard Martinez here. I want to travel from LAS to IAH for attending a Robotic workshop. Can you please help me for booking the flight ticket? 
 agent: Sure, may I know your travel dates please? 
 customer: My departure date is 04/04 and return date is 04/06. Make sure my price limit is 500. 
 agent: Thanks for waiting. I have found southwest airlines which flies with one connection. 
 customer: Please proceed for booking the flight ticket. 
 agent: Sure, your flight ticket has been confirmed now. 
 customer: Thank you for helping me. 
 agent: Thank you.
A:
book