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, I am John Phillips. 
 agent: Hello, how can I aid you today? 
 customer: I would like to visit at Washington for enjoying holidays, can you help me to book a flight ticket from LGA to IAD? 
 agent: Sure, we are glad to help you. Can you please share me your travelling dates? 
 customer: I am travelling from July 10 to July 12. 
 agent: Do you prefer any stopover in between journey? 
 customer: Yes, I need a stopover in between my journey. 
 agent: Do you prefer to travel in economy class or business class? 
 customer: I prefer economy class. 
 agent: Is there any airline preferences for you? 
 customer: No, I am comfortable with any airline. 
 agent: Do you have any other requirements to be met? 
 customer: No, thanks for asking. 
 agent: Ok, please wait for a while. I will revert you with the best flight. 
 customer: Sure, take your time. 
 agent: Thanks for waiting, there is a flight found in Hawaiian airline with a fare of 100 and the flight number is 1016. Shall I proceed for booking? 
 customer: Please proceed. 
 agent: Ok, your ticket is reserved in economy class. 
 customer: Thank you. 
 agent: Thank you for choosing us.
Example Output: book

Example Input: customer: Hi, Joshua Green here. 
 agent: Hello, how can I help you today? 
 customer: I am planning to book a flight in the afternoon time on 6th of Sept to reach Seattle, so please help me in booking a normal-cost flight. 
 agent: Sure, may I know your source and destination airport codes? 
 customer: Sure, my source and destination airport codes are DCA - SEA. 
 agent: May I know your return date? 
 customer: Sure, I intend to return on 8th of Sept. 
 agent: Do you need halt in between your journey? 
 customer: Yes, I prefer it. 
 agent: Ok, please wait for a moment. 
 customer: Sure. 
 agent: Sorry, there are no flights found with your given dates. 
 customer: No worries, thank you for informing me. 
 agent: Thank you for opting us.
Example Output: no_flight

Example Input: customer: Hi. Myself Jonathan Taylor. 
 agent: Hello, how may I support you today? 
 customer: I am planning for a trip with my family, can you help me with booking ticket from my departure in the afternoon time from JFK? 
 agent: Sure, please share me your destination airport code? 
 customer: Ok, my destination is LAX. 
 agent: May I know your planned journey dates? 
 customer: Fine, my planned dates are from Sept 17 to 19. 
 agent: Do you want any connection in between your flight journey? 
 customer: Yes, I need a connecting flight in a business class. 
 agent: Do you have any other preferences? 
 customer: No. 
 agent: Thank you for the details, sorry there is no flight found on your given journey data. 
 customer: It's ok, thanks for your information. 
 agent: Thank you for reaching us, we hope see you again.
Example Output:
no_flight