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, how may I assist you at this moment?
customer: I am Jonathan Brown, I need to book a flight ticket to IAH from ATL. Can you please help me to book a flight ticket?
agent: Ok, may I know your planned dates of journey please?
customer: I am travelling on these dates 03/29 and 03/31.
agent: Frontier airline is providing a flight which costs 100 with a single connection limit. Would you like to book this flight?
customer: Ok, you can proceed with this flight.
agent: I have booked your flight ticket with the flight 1012.
customer: Thank you for your services.
agent: You are most welcome, thank you for reaching our service.
book