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
Q: customer: Hello. 
 agent: Hello. 
 customer: Carolyn Baker, here. 
 agent: Can you please tell me how can I assist you? 
 customer: Due to prepone of my exams I want to cancel my reservation. 
 agent: Ok, I can help you by cancelling your ticket and before that can you please tell me do you have any new reservation? 
 customer: Sure. No I am not planning to go to travel. 
 agent: Sorry to say, no reservation found on your name to cancel. Thank you for reaching us. 
 customer: That's fine, thanks for helping me out.
A:
no_reservation