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 aid you? 
 customer: Can you please help me with changing my reservation due to some changes in the trip plan? 
 agent: Sure, we are here to help you. 
 customer: Thank you. 
 agent: Can I have your name to check your details in our reservation list? 
 customer: My name is Nicholas Hall. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: Nicholas Hall, we didn't found any reservation found on your name. 
 customer: Not an Issue, thank you for checking it for me. 
 agent: Thank you for contacting us.
Student:
no_reservation