Detailed Instructions: 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
Problem:customer: Hello. 
 agent: Hello, how may I help you? 
 customer: I want to change my reservation, can you help me with that? 
 agent: I can help you, can I know your name? 
 customer: Sure, Deborah Nelson here. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Sorry Nelson, there is no active reservation found with your name. 
 customer: Oh, it's very sad to hear from your side. Thanks for the information. 
 agent: My pleasure.
Solution:
no_reservation