Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello. 
 agent: Hello,. How can I amend you today? 
 customer: My plan to go for a holiday trip got postponed, could you please help me in changing my reservation? 
 agent: Sure, we are here to assist you. 
 customer: Thank you. 
 agent: Let me know your name for further process. 
 customer: My name is Ronald King. 
 agent: Please, wait. 
 customer: Ok. 
 agent: Thanks for your time. There is no reservation found on your name in our database. 
 customer: Ok, thanks for the information. 
 agent: Thank you for opting us.
Student:
no_reservation