Definition: 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 can I assist you for the day? 
 customer: Please change my active reservation as my exams was postponed. 
 agent: Sure, I am here to help you. 
 customer: Thank you. 
 agent: May, I know your good name? 
 customer: Myself Jonathan Carter. 
 agent: Sorry, we found no reservation on your given name. 
 customer: Ok, no problem. Thank you. 
 agent: Thank you for reaching us.
Output:
no_reservation