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 assist you today? 
 customer: I am Raymond White, I want to change my reservation as my plan to meet my friend is postponed due to my bad health. Can you help me to change my reservation. 
 agent: Sure, I am here to help you. Ok, please wait a moment. 
 customer: Sure. 
 agent: Thanks for waiting. Sorry, there is no reservation found on your name. 
 customer: Ok, thank you for the information. 
 agent: Thank you for opting us.
Solution:
no_reservation