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: Hi. 
 agent: Hello, how may I serve you today? 
 customer: Can you please help me in cancelling my recent reservation? 
 agent: Sure, I am here to help you with this. May I know your name please? 
 customer: I am Dennis Wilson. 
 agent: Ok, wait for a mean while please. 
 customer: Ok. 
 agent: Sorry to say, that there is no active reservation found as per your name to cancel it in your database. 
 customer: No issues, thank you. 
 agent: You are welcome.
Output:
no_reservation