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

customer: Hello. 
 agent: Hello, how can I aid you today? 
 customer: I am Jessica Phillips. I would like to experience the Boston tea party ship, can you help me in booking my ticket with direct flight? 
 agent: Sure, let me know your journey airport codes for booking. 
 customer: My source point is NV-LAS. 
 agent: Ok, may I know your budget? 
 customer: My destination point is MA-BOS. My budget will be 500. 
 agent: Please assign your journey dates. 
 customer: My starting date is 02/16, my return date will be  02/18. 
 agent: Ok, please be on hold. 
 customer: Sure. 
 agent: Sorry to inform you that, there were no flight running at that location due to abnormal weather conditions. 
 customer: Its ok, thank you for your support. 
 agent: Thank you for availing our agency.
no_flight