Given the task definition and input, reply with output. 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

customer: Hello. 
 agent: Hello, How can I assist you? 
 customer: I want to cancel my recent reservation due to the ongoing tornado at my destination. Can you help me with that? 
 agent: Sure. May I know your name? 
 customer: I am Carol Green. 
 agent: Please wait a minute. 
 customer: Sure. 
 agent: Sorry, No reservation found on your name. 
 customer: Ok, no problem. Thanks for the information. 
 agent: Thank you for opting us.
no_reservation