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: My name is Charles Robinson. 
 agent: How can I assist you? 
 customer: Due to a minor accident, my family trip is cancelled. Can you help me in cancelling the reservation? 
 agent: Sure, please give me a minute and I will be back with your details. 
 customer: Sure. 
 agent: Sorry, there is no reservation found on your name. 
 customer: That's ok. Thank you for your time. 
 agent: Thank you, have a good day.
A:
no_reservation