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, I am Stephanie Carter. 
 agent: Hello, how may I be your helping hand today? 
 customer: I need a direct flight to attend a client meeting in Chicago, so please book a flight ticket from Minneapolis & St. Paul. 
 agent: Sure, I am here to help you. Please specify your airport codes that you wish to board and land? 
 customer: My source and destination airport codes are MSP and ORD. 
 agent: On which dates would you like me to book a flight ticket? 
 customer: I want to fly on Sept 09, return on Sept 11. 
 agent: Do you need any lay by in between your journey? 
 customer: No, I need a direct flight. 
 agent: Please wait for some time. 
 customer: Sure. 
 agent: Thanks for waiting, there is no flight found on your journey dates. 
 customer: Ok, no problem. Thank you. 
 agent: Thank you for availing us, hope to serve you again.
Student:
no_flight