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, I am Brain Scott. 
 agent: Hello, How can I serve you? 
 customer: I want to cancel my recent reservation due to the ongoing tornado at my destination. Can you help me to cancel my recent reservation? 
 agent: Sure, I am mirthful to help you. Ok, wait for a minute. 
 customer: Sure. 
 agent: We found a reservation on your name, Shall I proceed with the cancellation? 
 customer: Ok, proceed. 
 agent: Your reservation has been cancelled. 
 customer: Thank you for your quick response. 
 agent: Thank you for opting us, Have a great day.

Ex Output:
cancel


Ex Input:
customer: Hi. I am Daniel Moore. 
 agent: Hello, how can I help you? 
 customer: I want to attend a political meeting at Charlotte. Can you help me in my reservation? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: Please provide me your travelling dates? 
 customer: I Will start my journey on 06/14. I will return back on 06/16. 
 agent: Kindly mention me your airport codes? 
 customer: My source airport code is New York, NY - JFK. My destination airport code is Charlotte, NC - CLT. 
 agent: Do you have any specifications? 
 customer: I need a layover in my journey. I can pay up to 1000. 
 agent: Please wait a minute. 
 customer: Sure. 
 agent: Thanks for waiting, sorry to inform you that there are no flights with your specifications. 
 customer: Not an issue. Thank you for your kind information. 
 agent: Thank you for reaching us.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: Actually, my friend book a flight ticket in economy class instead of business class. Can you please help me in changing of my existing reservation? 
 agent: Sure, may I know your good name please? 
 customer: Myself Catherine Wilson. 
 agent: Please wait for a moment. 
 customer: Ok. 
 agent: Sorry, there is no reservation found on your name in our database to change. 
 customer: Ok, no problem. Thank you for your information. 
 agent: You are most welcome.

Ex Output:
no_reservation