Q: 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
customer: Hello, I am Angela Phillips. 
 agent: Hello, how can I help you? 
 customer: Due to an emergency meeting, I want to cancel my reservation. Can you help me with it? 
 agent: Ok, please wait I will revert you in a moment. 
 customer: Sure. 
 agent:  Sorry to inform you that no reservation was found on your name. 
 customer: No problem, thank you for the information. 
 agent:  Thank you for availing us.
A:
no_reservation