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 best I can aid you today? 
 customer: I am Carol Rodriguez. I want to cancel my recent reservation. Could you help me with that? 
 agent: Sure, we are here to help you with cancellation. 
 customer: Thank you. 
 agent: Please wait for a couple of minutes. 
 customer: Ok. 
 agent: Thanks for your time, there was no reservation found on your specified name to cancel it. 
 customer: That's ok, no problem. Thank you. 
 agent: Thank you for availing us.
no_reservation