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, do you need any help from us? 
 customer: I need to cancel my reservation. Do you provide cancellation services? 
 agent: Sure, I am happy to help you. Could I have your name please? 
 customer: My name is George Perez. 
 agent: Sorry, there is no reservation matching with your name in our portal to cancel further. 
 customer: It's ok, no issues. Thank you for the information. 
 agent: Thank you for consulting us, have a great day.
no_reservation