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 may I aid you? 
 customer: Can you please help me in booking a flight ticket from Orlando, MCO to Houston, HOU? 
 agent: May I know on which dates you are willing to travel? 
 customer: My journey dates are from Oct 31 to Nov 02. 
 agent: Do you have any other requirements? 
 customer: I prefer only economy class flight. 
 agent: May I know your name? 
 customer: My name is Nancy Davis. 
 agent: Sorry to inform you that unfortunately there is no flights available by the given details. 
 customer: Ok, that's not a problem. Thanks for your information. 
 agent: Thank you.
Output:
no_flight