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, what can I aid you at this moment?
customer: Here John King. I need a flight from JFK to IAD to attend a live concert, can you please help me in flight ticket booking?
agent: I am here to help you about your flight ticket booking, can you please provide your scheduled dates of trip?
customer: My trip dates are 05/18 and 05/20.
agent: AA airline is providing a flight which costs 100 with a single connection limit. Would you like to book this flight?
customer: Sure, you can proceed with booking on my name which I have mentioned.
agent: I have booked your flight ticket with the flight 1006.
customer: Thank you for your help in my ticket booking.
agent: Most welcome, thank you for choosing our service.
customer: You are most welcome.
book