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

Example Input: customer: Hello, my name is Katherine Miller.
agent: Hello, Katherine Miller. How can I assist you?
customer: I am planning to spend my vacation holidays with my brother, so I need to make a flight reservation.
agent: OK, what is your exact destination and when do you want to go?
customer: My destination airport is PA-PHL, and my travelling dates are departure on 03/20 and arrival on 03/22.
agent: Let me know your source point.
customer: My source airport is San Francisco, CA-SFO.
agent: Sorry to inform, no flights are found regarding to your specifications.
customer: That's not a problem, thanks for your information.
agent: Thanks for choosing us. Have a great day.
Example Output: no_flight

Example Input: customer: Hi, Jason hill here.
agent: Hello.
customer: I need to book a flight ticket to New York to enjoy music festivals with family.
agent: How can I help you? Can you please share your dates of travelling?
customer: My travel dates are 05/21 and 05/23.
agent: May I know price limit?
customer: I need a direct flight within range of 1000.
agent: Can I have your airport codes?
customer: I will depart from CA-OAK to NY-LGA.
agent: Please wait.
customer: Ok.
agent: Thanks for your time, sorry, no flights found on that day.
customer: Ok, thank you.
agent: Thank you for picking us.
Example Output: no_flight

Example Input: customer: Hello.
agent: Hello, how may I assist you?
customer: I am Donald Garcia. My business meeting is postponed, so I need your help me to change my existing recent reservation, can you help me?
agent: Donald, please wait for a moment.
customer: Ok.
agent: I am sorry Donald, there is no reservation with your details.
customer: Thank you for your service.
agent: Thank you for contacting us.
Example Output:
no_reservation