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. 
 agent: Hello, how may I help you? 
 customer: Can you please help me in booking a flight ticket from IAH to DEN? 
 agent: Sure, may I know your travelling dates? 
 customer: I want to fly on Nov 16 and return on Nov 18. 
 agent: Do you have any other specifications? 
 customer: I would like to prefer economy class. 
 agent: May I know your name? 
 customer: Myself Larry Taylor. 
 agent: Can I know your connection limit? 
 customer: I need a single connection. 
 agent: We found a flight on Southwest airline, flight number 1018 with the fare of 100. Can I proceed for booking? 
 customer: You can proceed to booking. 
 agent: Your ticket has been booked. 
 customer: Thank you. 
 agent: Thank you for choosing us.
A:
book