Given the task definition and input, reply with output. 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

customer: Hello.
agent: Hello, welcome to flight ticket booking agency.
customer: Thank you.
agent: How may I help you?
customer: Can you help me in booking a flight ticket from JFK to DCA?
agent: Sure, I can reserve a flight ticket for you. Can I know your respective name please?
customer: I am George Carter.
agent: Ok, when do you want to depart from JFK and return back from DCA?
customer: I want to travel on 10/23, and return on 10/25.
agent: Ok, please let me know the connection limit preference.
customer: I need a connecting flight.
agent: There is an economy class flight in this route. Is that ok for you?
customer: Yes.
agent: If you have any other requirements that should met, please tell me?
customer: No.
agent: Ok, the flight is available in the JetBlue airlines which is departing and returning in the afternoon time and the flight ticket cost is 100. Shall I reserve the ticket?
customer: Proceed with the booking.
agent: I have confirmed your flight ticket with the service number 1008. Have a nice and happy journey.
customer: Thanks for the assistance.
agent: That's my pleasure to assist you. Thank you for contacting us.
book