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, I am Steven Miller. 
 agent: Hello. How can I help you? 
 customer: I would like to attend my friend birthday, can you please book me a ticket? 
 agent: Sure, may I know your travelling dates? 
 customer: My travelling dates are from 12/17 to 12/19. 
 agent: Please let me know your airport codes? 
 customer: My preferable airport codes are from SFO to IAH. 
 agent: Do you have any connection limit? 
 customer: Yes, I have one connection limit. 
 agent: Please wait a while. 
 customer: Ok. 
 agent: Thanks for being waiting. We found a Spirit airline,flight number:1008 and the price is 100. 
 customer: Ok, book this flight. 
 agent: Your flight ticket has been confirmed. 
 customer: Thanks for booking. 
 agent: Thank you for consulting us.
A:
book