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, how may I be at your service today?
customer: Can you please help me to book a flight from CLT to MCO?
agent: Sure, I will help you in booking the ticket. May I know your travelling dates please?
customer: I want to depart on Nov 21 and need to return on Nov 23.
agent: Do you have any other specifications?
customer: I need a connecting flight.
agent: Please help me with your name for booking.
customer: Thomas Carter here.
agent: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 with flight number 1002. Shall I proceed with this flight?
customer: Ok, please proceed.
agent: Your booking is done.
customer: Thank you.
agent: Most welcome.

Ex Output:
book

Ex Input:
customer: Hello.
agent: Hello, how can I help you today?
customer: Myself Janet Perez. Due to some problems I am unable to travel in flight so can you please cancel my flight ticket?
agent: Sure, we are here to help you. Wait for some time.
customer: Ok, thank you for your positive response.
agent: Thanks for waiting there is no reservation found on your name.
customer: Oh! It's ok no problem. Thank you for your information.
agent: Thanks for approaching us.

Ex Output:
no_reservation

Ex Input:
customer: Hi.
agent: Hello. How may I help you?
customer: Can you please help me in booking a flight tikcet to LAS from SEA?
agent: Sure, may I know your trip dates?
customer: My travel dates are from Dec 31 to Jan 02.
agent: Do you have any other requirements?
customer: I need a connecting flight.
agent: Can I know your name please?
customer: I am Samantha Garcia.
agent: Please wait for a while.
customer: Ok.
agent: Thank you for waiting and we have found a flight in economy class with 1 connection in Delta airlines and the fare of your flight will be 100. Do you like me to proceed your booking with this flight?
customer: You can proceed with booking.
agent: Ok, your ticket is booked with the flight number 1029.
customer: Thank you.
agent: Most welcome.

Ex Output:
book