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: Hi,. 
 agent: Hello,. On what way, can I assist you the best today? 
 customer: Please cancel my recent reservation. 
 agent: Sure, I will help you in cancellation. To cancel your ticket, we need your name. Can you provide it? 
 customer: I am Katherine Baker. 
 agent: Thanks for the details, please wait. 
 customer: Sure. 
 agent: Thanks for your time. Sorry Katherine, Unfortunately there is no active reservation on your name to cancel it. 
 customer: Thank you. 
 agent: Thanks for choosing us for your ticket cancellation process.
no_reservation