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 assist you the day? 
 customer: I am planning to visit a Central Park at New York due to some issues it was postponed, so can you help me with changing my existing reservation? 
 agent:  Sure, I am here to serve you. Please mention your name to proceed to next step? 
 customer: My name is Kenneth Miller. 
 agent: Ok, please wait for a minute. I will revert to you. 
 customer: Sure, I will wait. 
 agent: Thank you for the patience. We did not find any reservation that matches with your name. 
 customer: Not an issue. Thank you for your response. 
 agent: Thank you for approaching us, regarding ticket changing procedure.
Example Output: no_reservation

Example Input: customer: Hi. 
 agent: Hello. How may I guide you today? 
 customer: Can you find a flight for me from OAK to DFW? 
 agent: Sure, I am here to help you with that. Can you please share your planned travel dates? 
 customer: Ok, my journey dates are from June 05 to 07. 
 agent: May I know your name please? 
 customer: Sure, I am Stephen White. 
 agent: Do you have any class preference? 
 customer: No, I need a connecting flight. 
 agent: Would you like to travel in a connecting flight or in direct flight? 
 customer: I need a connecting flight as I said before. 
 agent: Do you have any other specifications? 
 customer: No. 
 agent: Flight-1017 is available in Delta Airlines with single connection limit and the ticket price is 100. Shall I proceed with booking? 
 customer: Yes, please. 
 agent: Stephen White, your booking is done in economy class, the depart time and return time is  afternoon. 
 customer: Thank you. 
 agent: Most welcome, thank you for reaching us. Have a safe journey.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello, how can I assist you? 
 customer: Could you help me in booking a flight ticket from LGA to DFW? 
 agent: Sure, I can help you with that. May I know your travel dates please? 
 customer: I would like to fly on Apr 14, return on Apr 16. 
 agent: Do you need break in between your journey? 
 customer: I need a single connecting flight. 
 agent: Please let me know if you have any other specifications. Can I have your good name please? 
 customer: I do not have any other specifications. 
 agent: Ok, please provide your good name. 
 customer: My name is Margaret Baker. 
 agent: Sorry, there are no flights available for you on those dates. 
 customer: No problem, thank you. 
 agent: Thank you for choosing us.
Example Output:
no_flight