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 Jack Perez. 
 agent: Hello. How can I help you? 
 customer: I would like to visit Statue of Liberty in New York, so could you please book a ticket for me? 
 agent: Sure. I will help you to book a flight, can you please provide me your travelling dates? 
 customer: Sure, I would like to go on 11/09 and return back on 11/11. 
 agent: Ok, please share me your travelling airport codes. 
 customer: My source and destination airport codes are ORD and LGA. 
 agent: Give me a moment. 
 customer: Ok, ensure it is a single connecting flight. 
 agent: Sorry, there is no flight is found on your route with single connection. 
 customer: That's ok, thank you for checking. 
 agent: Welcome. Thank you for choosing us.

Ex Output:
no_flight


Ex Input:
customer: Hello,. I am Susan Gonzalez. 
 agent: Hello, how can I help you? 
 customer: I need to book a flight ticket from Seattle to meet my grandparents after a long time in Washington. Can you please help me in booking? 
 agent: Sure, may I know your planned travel dates? 
 customer: My depart is on 03/17 and arrival on 03/19. 
 agent: Please share me your source and destination codes. 
 customer: My source code is WA-SEA and destination code is DC-IAD. 
 agent: May I know your price limit? 
 customer: I can spend up to 5000. 
 agent: Please wait for a moment. 
 customer: Ok. 
 agent: Thanks for waiting, sorry to say that, no flights were found with your details. 
 customer: Ok, no issue. 
 agent: Thank you for opting us. 
 customer: Thank you for your support.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello. How can I aid you today? 
 customer: I am Richard Williams here, I want to reserve my ticket from HOU to ORD, can you please help me out? 
 agent: Ok, may I know your travelling dates? 
 customer: Sure, my willing to travel dates are from Oct, 17 to Oct, 19. 
 agent: Can you please mention your depart and arrival timings? 
 customer: Yes, I need a return time at morning. 
 agent: May I know your connection limit? 
 customer: Yes, I need a direct flight. 
 agent: Ok, please wait for a while. 
 customer: Sure, I will wait. 
 agent: Sorry, no flights found on your route to reserve your ticket. 
 customer: Ok, no problem. Thank you for your service. 
 agent: Thank you for connecting with us.

Ex Output:
no_flight