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

Input: Consider Input: customer: Hi.
agent: Hello. How can I help you at this moment?
customer: I want to change my existing reservation which is done recently due to some health issues, can you please help me?
agent: Sure, I will aid you in changing your reservation.
customer: Thank you for considering my request.
agent: May I know your name please.
customer: Sure, my name is Joshua Green.
agent: Sorry to say this, no reservation found on your name in our database.
customer: Ok, no problem. Thank you for your service.
agent: Thank you for reaching us.

Output: no_reservation

Input: Consider Input: customer: Hello.
agent: Hello. How can I aid you?
customer: Can you aid me to book a ticket from MSP to AUS?
agent: Sure, can I have your travelling dates please?
customer: My trip dates are June 9 and June 11 respectively.
agent: Please provide your specifications.
customer: Make sure that connection limit is single.
agent: May I know your good name please?
customer: David Carter here.
agent: Unfortunately there is no flight found with your given details.
customer: Oh! ok.
agent: Thank you for reaching us.
customer: Thank you.

Output: no_flight

Input: Consider Input: customer: Hello.
agent: Hello, how can I guide you for today?
customer: My name is Barbara Clark. I want to book a flight from DCA to SEA, can you please assist me in that?
agent: Can you please share on what dates you are willing to travel?
customer: I will start on Feb 26th and will return back on Feb 28th.
agent: Do you have any airline preferences?
customer: I am looking for a normal-cost airline.
agent: Do you have any class preferences?
customer: No, I don't have.
agent: Do you have any other requirements that you are looking for?
customer: I want to depart in the evening and return in the afternoon.
agent: There is a flight with ticket fare 200 in AA airlines with a stopover in economy class. Is it ok for you?
customer: Please proceed with the booking.
agent: Your booking is confirmed with flight number 1012. Departure time is 2:00 AM and arrival time is 19:00 PM.
customer: Thank you for your help with the booking.
agent: Thank you for contacting us, have a nice day.
Output: book