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,. How may I assist you today? 
 customer: I am Margaret Wilson. Actually I have a board meeting with clients in New York, but it is cancelled now. So, I am willing to return to my home, please change my existing reservation. 
 agent: Sure, give me a minute I will check with the current status and revert you. 
 customer: Ok. 
 agent: Sorry, unfortunately there is no reservation found on your name. Thank you for opting us. 
 customer: OK, I am glad at your service. Thank You.
A:
no_reservation