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. 
 customer: I am Kenneth Harris. 
 agent:  How can I help you? 
 customer: I want to change my existing reservation due to some issues, can you please help me with that? 
 agent: OK, please wait I will revert you. 
 customer: Ok. 
 agent:  Sorry, no reservation was found on your name. 
 customer: Ok, no issues. 
 agent:  Thank you for availing us. 
 customer: Thanks for your information.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: Can you please help me to book a flight from HOU to SEA? 
 agent: Sure, can you please mention your depart and arrival dates of your journey? 
 customer: My travel dates are Apr 06 to 08. 
 agent: Do you have any connection limit? 
 customer: I prefer connecting flight. 
 agent: Are there any other specifications? 
 customer: No. 
 agent: Can I know your good name? 
 customer: I am Alexander Turner. 
 agent: Sorry, no flights are available in this route as per your requested dates. 
 customer: No problem, thank you for the information. 
 agent: Thank you for reaching us.
Example Output: no_flight

Example Input: customer: Hello. 
 agent: Hello. How may I assist you? 
 customer: I am planning to attend my college fest from DCA to DFW. Can you make a reservation for me? 
 agent: Ok, I will help you with that. May I know the travel dates to book? 
 customer: Sure, my itinerary dates are on 03/16 and back on 03/18. 
 agent: Ok, there is a flight with 1 connection limit and the airfare is 300. Can I book? 
 customer: Yes, you can proceed with the booking. 
 agent: May I know your name to book? 
 customer: Yes, I am Joseph Harris. 
 agent: Thank you for providing your travel details, the flight is been booked. 
 customer: Thank you for your service. 
 agent: The airlines is JetBlue and the flight is 1025. Thank you for choosing our agency.
Example Output:
book