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
Input: customer: Hello. 
 agent: Hello, how may I help you today? 
 customer: Can you help me to change my recent reservation? 
 agent: Sure, I am happy to help you with this. 
 customer: Thank you. 
 agent: May I know your name please for further process? 
 customer: Ronald Nelson here. 
 agent: Ok, please wait for a mean while. 
 customer: Sure. 
 agent: Sorry Nelson, there is no active reservation found as per your name to modify your reservation. 
 customer: That's ok, thank you for checking. 
 agent: You are welcome.
Output:
no_reservation