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 can I assist you today? 
 customer: I want to cancel my ticket due to dense fog in my place. 
 agent: Sure, may I know your name to check for the previous reservation? 
 customer: Brandon Collins here. 
 agent: Please allow me a moment. 
 customer: Sure. 
 agent: There is no reservation found under your name. 
 customer: No problem, thank you. 
 agent: Thank you for contacting us.
A:
no_reservation