Detailed 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
Problem:customer: Hello,. I am Helen Young. 
 agent: Hello, how can I help you today? 
 customer: I need to visit Lyndon Barnes Johnson library at Austin. Can you book me a flight ticket? 
 agent: Sure, please share your planned trip dates? 
 customer: I want to travel on 11/30, and need to catch return flight on 12/02. 
 agent: Ok, let me know your boarding and landing airport codes? 
 customer:  I need to leave from my nearest airport JFK to reach AUS. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Thanks for waiting, no flights found with your requested details. 
 customer: Ok, no issues. Thanks for the information. 
 agent: Thank you for opting us.
Solution:
no_flight