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 may I help you today? 
 customer: I am Rebecca Taylor. As my business trip has been cancelled, can you help me in cancelling my reservation. 
 agent: Sure, I will help you with that. Please wait for a moment, while I search for the reservation on your name. 
 customer: Sure. 
 agent: Thanks for waiting, Sorry I did not find the reservation on your name. 
 customer: Not an issues, thank you for your quick response. 
 agent: Thank you for reaching us, have a nice day ahead.
Output:
no_reservation