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. 
 customer: I am Donald Jones. 
 agent: How can I help you Donald? 
 customer: I want to cancel my reservation, can you help me? 
 agent: Sure, I will help you. 
 customer: Thanks. 
 agent: Please wait for a moment. 
 customer: Ok. 
 agent: No reservation is available under your name. 
 customer: That's ok, thank you. 
 agent: You are welcome.
Solution:
no_reservation