Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello,. This is Janet Clark, from Las Vegas. 
 agent: Hello, how may I provide service to you? 
 customer: I am planning to visit NASCAR hall of fame museum at Charlotte, can you please help me in reserving a flight ticket? 
 agent: Sure, we are perky to help you. 
 customer: Thank you. 
 agent: Can you please let me know your airport codes? 
 customer:  I need to leave from my nearest airport LAS to reach CLT. 
 agent: When you are planning to make your journey? 
 customer: I want to travel on 05/08, and need to catch return flight on 05/10. 
 agent: Do you prefer any flag stop in between journey? 
 customer: Yes, I need a flag stop. 
 agent: Ok, please be on hold. 
 customer: Sure. 
 agent: Sorry to inform you that, there are no flights are available on your requested dates. 
 customer: Ok, no issues. Thanks for the information. 
 agent: Thank you for choosing  us, have a nice day.
Student:
no_flight