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: 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: Hi, Donald Scott here. 
 agent: Hello, how can I assist you at this moment? 
 customer: Can you please reserve me a flight ticket from LAX to AUS? 
 agent: Sure, I will help you with this. Can you please provide your journey dates? 
 customer: My travel dates are 06/03 - 06/05. 
 agent: Do you need any halt in this journey? 
 customer: Yes, I need a single connection. 
 agent: Do you have any other specification for this trip? 
 customer: No. 
 agent: Donald Scott, there are no flight services available on this route on your provided dates. 
 customer: No issues, thank you for your information. 
 agent: Thank you for utilising our service.
Example Output: no_flight

Example Input: customer: Hello, I am Samantha  Wright. 
 agent: Hello, how may I oblige you today? 
 customer: I need to attend the birthday party at Denver for enjoying with my childhood friends. Could you please help me in booking a ticket from SEA and DEN? 
 agent: Sure, can you please mention your journey dates? 
 customer: My travelling dates are 11/25 and return on 11/27. 
 agent: Ok, do you have any other specifications? 
 customer: Price should be below 1000. 
 agent: Ok, please wait a while. 
 customer: Sure. 
 agent: Thank you for waiting, there is a flight in JetBlue airline with a halt in between your journey. 
 customer: You can proceed. 
 agent: The flight number is 1006 and the price is 200. Your booking has done. 
 customer: Thank you for your quick response. 
 agent: Thank you for choosing us.
Example Output:
book