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

Ex Input:
customer: Hello.
agent: Hello.
customer: Emily Clark here.
agent: How may I lend a hand to?
customer: I need to have a flight ticket from OAK to AUS for an important business meeting, can you please help me out with booking of a flight ticket on those locations?
agent: Sure Clark, When you are willing to travel?
customer: I would like to start my journey on 12/29.
agent: Just a moment.
customer: Sure.
agent: Can you please share me your return dates?
customer: I would like to return on 12/31.
agent: Clark sorry to intimate, no flights are available with your requirements.
customer: Oh! Sad to hear that. Anyway, I will contact another agency to go there. Thank you for the information.
agent: You are welcome, thank you very much for contacting us.

Ex Output:
no_flight

Ex Input:
customer: Hi.
agent: Hello. How may I assist you today?
customer: Can you please book my flight ticket from EWR to MSP?
agent: Sure, I will help you. On which dates do you want to travel?
customer: My trip dates are 04/13 and 04/15.
agent: Could you please provide your name to book your flight ticket?
customer: Myself Dennis Brown.
agent: Ok, please hold on a moment to check the flights availability.
customer: Ok.
agent: Based on your information, flight number 1018 from Frontier airlines with 1 connection with the fare of 300 is available for you. Shall I proceed with this?
customer: Can you please search a flight ticket with price 200 or otherwise don't confirm this ticket.
agent: Sorry to inform you that, there are no flights available with in that budget.
customer: Ok, fine thank you for searching a flight ticket for me.
agent: Thank you for approaching us, have a great day.

Ex Output:
no_flight

Ex Input:
customer: Hello.
agent: Hello, how may I help you?
customer: I am Carolyn King. Can you please help me in booking the ticket from LGA? As I'm planning to visit New York Great Library.
agent: Sure, could you please provide your travelling dates to search for the flight?
customer: My travelling dates are 05/21 and return on 05/23.
agent: May I know your destination airport code?
customer: It is a round trip.
agent: Ok, please wait for a moment.
customer: Sure.
agent: There is a connecting flight 1005 with price 100, can I proceed?
customer: You can proceed with booking.
agent: Your booking is done.
customer: Thank you for your quick response.
agent: Welcome.

Ex Output:
book