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? 
 customer: Due to heavy rain fall my trip has been postponed.Can you please help me for changing the existing reservation? 
 agent: Sure, I will help you in this intent. 
 customer: Thank you. 
 agent: May I know your name please for further process of changing your reservation? 
 customer: My name is George White. 
 agent: George, please wait for a mean while. 
 customer: Sure. 
 agent: Sorry George, there is no reservation found on your name to change your reservation as per your details. 
 customer: Ok, no problem. 
 agent: Are you expecting any other help from my side? 
 customer: No, thank you for your information. 
 agent: You are welcome always.
Output:
no_reservation