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 can I assist you? 
 customer: Can you please book a ticket from IAH to SFO to attend for a live concert? 
 agent: Sure, can I know the trip dates please? 
 customer: My travelling dates are Oct 8 and Oct 10. 
 agent: May I know your name please? 
 customer: Sure, I am Carolyn Lopez. 
 agent: Can I know the connection limit please? 
 customer: I want single connected flight. 
 agent: Do you have any requirements? 
 customer: My return time is afternoon. 
 agent: Ok, wait a moment please. 
 customer: Sure. 
 agent: There is a connecting flight in United airlines, can I book it? 
 customer: Yes, please proceed. 
 agent: Your ticket has been booked with flight number 1026 in economy class. 
 customer: Thank you. 
 agent: Thank you for approaching us.
A:
book