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. 
 agent: Hello, how can I aid you? 
 customer: I want to cancel my reservation, can you please help me? 
 agent: Sure, I can help you with that. May I know your good name please? 
 customer: My name is Christine Roberts. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Christine Roberts, there is no active reservation found under your name to do cancellation. 
 customer: Ok, not a problem. Thank you. 
 agent: Thank you for choosing us.
A:
no_reservation