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: Hello. 
 agent: Hello. How can I help you? 
 customer: I am Elizabeth Anderson. I am planning to visit Magic Kingdom at Orlando, could you please help me with booking a flight ticket from LAS to MCO? 
 agent: Yes, I can help you. Can you share me your travelling dates? 
 customer: I would like to take off on 05/27 and return on 05/29. 
 agent: Give me a moment. 
 customer: Sure, take your time. 
 agent: I have found a flight ticket with a price of 100 and 1 connection. 
 customer: Please confirm the booking. 
 agent: Ok, your ticket is booked. 
 customer: I really appreciate your help, thank you for your service. 
 agent: Thank you for contacting us.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello. How may I help you? 
 customer: Could you please help me in flight ticket booking process from ORD to MSP? 
 agent: Sure, can you please tell me your trip dates? 
 customer: Thank you for your response, I want to take off on Nov 11 and book my return ticket also on Nov 13. 
 agent: Do you have any other requirements? 
 customer: I will prefer 1 break in between my journey. 
 agent: Ok, please wait a minute. Thank you for waiting and we have found a flight in economy class with 1 connection in Frontier airlines and the fare of your flight will be 100. Do you like me to proceed your booking with this flight? 
 customer: Please confirm this flight ticket on my name Kathleen Thomas. 
 agent: Your ticket is booked in 1001 flight. 
 customer: Thank you. 
 agent: Most welcome.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello. How may I assist you? 
 customer: I want to travel from MSP to SEA. Can you book a flight ticket for me? 
 agent: Sure, tell me your travel dates please? 
 customer: I want to fly in the flight on May 27 and May 29. 
 agent: May I know your name please? 
 customer: I am Edward Robinson. 
 agent: Do you have any connection limit? 
 customer: No, but I want to travel in economy class. 
 agent: Ok, please wait. 
 customer: Ok, take your time. 
 agent: Thanks for your time. Sorry to say that there no flights found with your flight details. 
 customer: That's ok. Anyways, thank you for your help. 
 agent: Thank you.
Example Output:
no_flight