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 may I assist you? 
 customer: Can you change my existing reservation? Because I postponed my trip due to ill health. 
 agent: Ok, please share your name. 
 customer: I am Carol Lewis. 
 agent: Wait a minute. 
 customer: Sure. 
 agent: Sorry, we could not found any reservation on your name. Sorry, there is no reservation found on your name. 
 customer: Thank you for your information. 
 agent: Thank you for choosing us.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: I am Mary Hill. 
 agent: Please let me know, What kind of service you are looking for today? 
 customer: Can you aid me to book a flight ticket from AUS to BOS? 
 agent: Sure, I can help you to make your journey successful. 
 customer: Thank you for positive response. 
 agent: Let me know when you are willing to travel to book a flight? 
 customer: My planned trip dates are Apr 23 and Apr 25 respectively. 
 agent: Which flight you have preferred to travel either a connecting flight or a direct flight? 
 customer: I would like to travel in connecting flight for my journey. 
 agent: At the time of take off and for your return journey, do you have any specific time concern? 
 customer: My return time should be in the afternoon. 
 agent: If you can help me with your name, I can begin looking up for the availability of flights. 
 customer: Please reserve my ticket with my name which I have already mentioned above. 
 agent: Thank you for providing all necessary details, please stand by I will check and revert to you. 
 customer: Take your time. 
 agent: Thank you for waiting and we have found a flight in an business class with 1 connection in United Airlines and the fare of your flight will be 900. Do you like me to proceed your booking with this flight? 
 customer: Please proceed with these airlines. 
 agent: Your ticket has been reserved with flight number 1028. 
 customer: Thank you for your service. 
 agent: Thank you for availing us.

Output: book


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: I am Barbara Clark. 
 agent: How can I help you? 
 customer: I want to have a reservation with the flight to Las Vegas which is rich for it's arts and culture. So, I am willing to have a trip in the month of March. Can you please help me in booking my flight ticket from Washington? 
 agent: Sure, may I know your airport codes please? 
 customer: Thank you for reacting positively. My airport codes are DCA and LAS respectively. 
 agent: May I know your travel dates please? 
 customer: Sure, my travel dates are 03/13 and 03/15. 
 agent: There is a flight with single connection, can I proceed for booking in Jet blue airlines? 
 customer: Yes, do proceed with the booking. 
 agent: Your booking is done in 1014 flight. 
 customer: Thank you for booking my flight ticket with the JetBlue airlines. 
 agent: Thank you for choosing us.
Output: book