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,. I am David Jones. 
 agent: Hello. How may I support you today? 
 customer: I want to cancel my reservation because I was having interview, but I am not fully prepared. Could you please help me? 
 agent: Sure, we are glad to help you. Please stand by. 
 customer: Ok. 
 agent: Thank you for your time, there is no reservation found on your name. 
 customer: Ok, no issues. 
 agent: Thank you for contacting us in cancelling your reservation. 
 customer: Thank you for your information.
A:
no_reservation