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. I am Katherine Edwards. 
 agent: Hello, what services are you seeking from us? 
 customer: I need to cancel my recent reservation, as my exam scheduled got cancelled. Can you please help me in cancelling? 
 agent: Sure, I am here to help you. Please allow me a few minutes to check the status of your reservation. 
 customer: Ok. 
 agent: Thanks for your time, we are sorry to inform you that no reservation was found on your name to cancel. 
 customer: Ok, no issues. Thank you for your help. 
 agent: Thank you for opting us.
no_reservation