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: Hi. Anna Robinson here. 
 agent: Hello. Glad to meet you Anna. How can I assist you at this moment? 
 customer: I have changed my holiday plans, so I want my destination to be changed. Can you help me with the change of flight reservation? 
 agent: Sure, I am here to help you with that. 
 customer: Ok. 
 agent: Please be hold on for a moment and I will check the existing reservation status. Sorry Anna, there is no reservation found under your name to change. 
 customer: That's not a problem. Thank you. 
 agent: My pleasure. Thank you for choosing us, have a great day.
Output:
no_reservation