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 aid you? 
 customer: I would like to travel from BOS to CLT as a business trip. 
 agent: Sure, can you share your journey dates? 
 customer: My trip dates are 09/26 and 09/28. 
 agent: Do you have any preferences? 
 customer: I need break in my journey. 
 agent: May I know your name? 
 customer: Emma Harris here. 
 agent: Sorry, there is no flight on your given dates. 
 customer: No problem, Thanks for the information. 
 agent: Thank you for opting us.
Output:
no_flight