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

Input: Consider Input: customer: Hello, I am Brain Scott. 
 agent: Hello, How can I serve you? 
 customer: I want to cancel my recent reservation due to the ongoing tornado at my destination. Can you help me to cancel my recent reservation? 
 agent: Sure, I am mirthful to help you. Ok, wait for a minute. 
 customer: Sure. 
 agent: We found a reservation on your name, Shall I proceed with the cancellation? 
 customer: Ok, proceed. 
 agent: Your reservation has been cancelled. 
 customer: Thank you for your quick response. 
 agent: Thank you for opting us, Have a great day.

Output: cancel


Input: Consider Input: customer: Hi. 
 agent: Hello. How can I assist you today? 
 customer: I am Karen Lee. I am planning to travel from HOU to SEA, can you help in booking  a flight? 
 agent: Definitely, I will help you with that booking. Please share your travelling dates. 
 customer: My travelling dates are 05/10 to 05/12. 
 agent: Just give a moment. 
 customer: Ok. 
 agent: Sorry, there is no flight available on your desired route. 
 customer: That's ok, thank you. 
 agent: Thank you for reaching us.

Output: no_flight


Input: Consider Input: customer: Hi. 
 agent: Hello, how can I aid you? 
 customer: I need to cancel my reservation for a client meeting but I have got a sudden call from my friend that one of my friend got met with an accident so I feel to cancel my reservation. Can you please help me out? 
 agent: Sure, can you please let me know your name to cancel? 
 customer: Amy Hill here. 
 agent: Sorry, there is no active reservation found under your name to cancel. 
 customer: That's ok, thank you for your help. 
 agent: Thank you for reaching us.
Output: no_reservation