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
One example: customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this? 
 agent: Sure, may I know your name please? 
 customer: My name is Anthony Phillips. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Unfortunately there is no reservation found with your given name. 
 customer: Not a problem, thank you for checking. 
 agent: Thank you for choosing us.
Solution is here: no_reservation
Explanation: Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation

Now, solve this: 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.
Solution:
no_flight