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. 
 agent: Hello, how may I aid you? 
 customer: I am Stephen Young. I am planning to visit some new places at Orlando, help me in booking my flight ticket with one halt. 
 agent: Sure, can you please share your travelling dates? 
 customer: My travelling dates will be 12/26 to 12/28. 
 agent: May I know your airport codes? 
 customer: I would like to start my journey from TX-DFW. My landing airport will be FL-MCO. 
 agent: Thanks for providing your details. Unfortunately there are no flights found with your requirements. 
 customer: Its ok, thank you for your assistance. 
 agent: Thank you for choosing us.
Example Output: no_flight

Example Input: customer: Hello. I am Christine Scott. 
 agent: Hello, how can I aid you today? 
 customer: I would like to book a ticket from ORD to DCA, can you please help me out? 
 agent: Sure, when are you planning to start and return on? 
 customer: I am travelling on these dates AUG 11th and 13th. 
 agent: Do you need a connecting flight or a direct flight? 
 customer: I need a connecting flight. 
 agent: There are no flights found with the given details. 
 customer: Ok no problem, thank you for your services. 
 agent: Thank you, please visit again.
Example Output: no_flight

Example Input: customer: Hello. 
 agent: Hello, how may I support you? 
 customer: Assist me in booking a flight ticket from SFO to DEN. 
 agent: I can definitely do that for you. Will you please let me know your maximum connection limit? 
 customer: Single connection flight is required. 
 agent: On what dates are you planning to make your trip? 
 customer: I preferred to travel in June 23 and June 25. 
 agent: Which airline will you prefer to travel in? 
 customer: I prefer to travel in normal cost airline. 
 agent: Do you need an economy class or business class? 
 customer: Economy class suits best to me. 
 agent: Please forward your name. 
 customer: This is Samantha Lewis. 
 agent: We found a direct flight on your way. Is that fine? 
 customer: Sure, proceed to book it. 
 agent: Your booking has been done in flight 1012 of United airlines with an estimate of 200. 
 customer: Thanks for your booking. 
 agent: Thank you for reaching us.
Example Output:
book