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 may I assist you? 
 customer: My name is Linda Wilson. 
 agent: Yes, Linda. 
 customer: I want to change my existing reservation because my exam has been postponed. Can you help me out? 
 agent: Sure, I will help you in modifying the reservation. 
 customer: Thank you. 
 agent: Please wait a moment, let me check the previous reservation details on your name. 
 customer: That's ok, no problem. 
 agent: Sure. In my search to your request, no reservation found on your name. 
 customer: Ok, may be my father has cancelled my reservation. 
 agent: Ok, please check your email again to verify your reservation details. 
 customer: Ok. Thank you for checking. 
 agent: My pleasure, thank you for reaching us. 
 customer: Welcome.
Example Output: no_reservation

Example Input: customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I made a reservation earlier to visit Phoenix in direct flight but now I want to travel in connecting flight. can you help me in changing my reservation? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: May I know your name? 
 customer: I am Sandra Carter. 
 agent: Please, wait for a moment. 
 customer: Ok. 
 agent: Thank you for waiting, there is no reservation found on your name to proceed for modification. 
 customer: No issue. Thank you. 
 agent: Thank you for approaching us.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello, how can I assist you? 
 customer: I want to cancel my reservation as my project got ramp down. Can you help me with that? 
 agent: Sure, may I know your name? 
 customer: I am Mary Martin. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Thank you for your valuable time, we found reservation on your name and cancelled successfully, amount will refund to your registered bank account within 3 working days. 
 customer: Thank you. 
 agent: Thank you for opting us.
Example Output:
cancel