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 aid you? 
 customer: Owing to an emergency, I would like to cancel my recent reservation. Will you help me with this? 
 agent: Sure, I can help you with that. May I know your good name please? 
 customer: My name is Kevin Garcia. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: Kevin Garcia, there is no active reservation found under your name to do cancellation. 
 customer: Ok, not an issue. Thank you for providing information. 
 agent: Thank you for choosing us.
no_reservation