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 may I help you for this moment? 
 customer: Due to my ill health, I would like to cancel my recent reservation. Please help me out. 
 agent: Sure, could you please mention your name for further process? 
 customer: My name is Elizabeth Green. 
 agent: Ok, please wait for a mean while. 
 customer: Sure. 
 agent: Sorry Green, there is no reservation found as per your name to cancel your reservation. 
 customer: Ok, no issue. Thank you for your information. 
 agent: You are welcome and have a great day.
Student:
no_reservation