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 may I help you? 
 customer: Katherine Perez here. Owing an emergency, I want to cancel my recent reservation. Can you please help me? 
 agent: Sure, I will help you in cancelling your ticket. Ok, please wait a moment. 
 customer: Ok, take your time. 
 agent: Thank you for waiting. 
 customer: My pleasure. 
 agent: Sorry, there are no reservations found on this name. Thank you for choosing our services. 
 customer: Thank you for your information.
no_reservation