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 help you today? 
 customer: Can you please help me in booking flight ticket from BOS to AUS? 
 agent: Sure, I am here to help you. May I know your name please. 
 customer: I am Matthew Roberts . 
 agent: Please mention your journey dates? 
 customer: My travelling dates are 03/20 and 03/22. 
 agent: Ok, please wait a while. 
 customer: Ok, sure. 
 agent: Sorry Roberts, no flights are available on your desired route. 
 customer: Ok, fine thank you for checking. 
 agent: Thank you for reaching us.
Example Output: no_flight

Example Input: customer: Hi. This is Michelle Clark, from Dallas. 
 agent: Hello, How may I assist you? 
 customer: Recently I made a reservation and now the trip has been postponed due to some issues. Can you help me in changing my ticket? 
 agent: Sure, I can help you. 
 customer: Thank you. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: Thanks for your time, there is no reservation found in your name. 
 customer: That's ok, not an issue. Thanks for your effort. 
 agent: Thank you for choosing us.
Example Output: no_reservation

Example Input: customer: Hello. I am Ryan Taylor. 
 agent: Hello, how can I assist you now? 
 customer: I need to cancel my recent reservation, as my business meeting with my clients got cancelled. Could you help me in cancelling my recent reservation? 
 agent: Sure, I would be happy to help you. Please wait for a while. 
 customer: Ok. 
 agent: Sorry there is no reservation found on your name. 
 customer: Ok, no issues at all. 
 agent: Thanks for choosing us and have a great day. 
 customer: Thank you for your service.
Example Output:
no_reservation