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: Hello. 
 agent: Hello. How can I help you? 
 customer: Can you book a flight ticket from JFK to ATL to attend my sister's marriage? 
 agent: Sure, may I know your name? 
 customer: Angela Johnson here. 
 agent: Can I have your planned journey dates? 
 customer: My planned travel dates are Oct, 4 and Oct, 6. 
 agent: Let me know your connection limit? 
 customer: I need a direct flight. 
 agent: Do you have any other requirements? 
 customer: My return time should be at evening. 
 agent: Please, wait a minute. 
 customer: Sure. 
 agent: Thank you for waiting, there were no flights available that matches your requirements. 
 customer: That's ok, thank you. 
 agent: Thank you for approaching us.
Output:
no_flight