Detailed Instructions: 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
Problem:customer: Hello. I am Brian Parker. 
 agent: Hello, how can I help you today? 
 customer: Can you help me in cancelling my recent reservation? 
 agent: Sure, please wait a moment. 
 customer: Sure. 
 agent: Sorry to say, no reservation found with your name. 
 customer: That's ok, no problem. Thank you. 
 agent: Thanks for reaching us.
Solution:
no_reservation