Definition: 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: customer: Hello. 
 agent: Hello. How can I assist you at this moment? 
 customer: The event which I am going to attend has been cancelled, please help me in changing my existing reservation. 
 agent: Sure, I am happy to help you with that. Can I have the name on which you reserved earlier? 
 customer: My name is Edward Anderson. 
 agent: Ok, please wait a moment and I will check reservation status. 
 customer: Sure. 
 agent: Thank you for waiting. Sorry Edward, no reservation found under your name to cancel. 
 customer: Ok, no issue. Thank you for your information. 
 agent: My pleasure. Thank you for choosing us, have a great day.
Output:
no_reservation