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. Myself Patricia Anderson. 
 agent: Hello, how may I assist you today? 
 customer: I need to travel Washington DC, can you please reserve flight ticket from PHX and IAD? 
 agent: Sure, do you prefer a stopover in between your journey? 
 customer: I need a direct flight for my journey. 
 agent: May I know your travelling dates? 
 customer: My travelling dates are Dec,12 and Dec,14. 
 agent: Is there any class preference? 
 customer: I don't have any class preference. 
 agent: Do you have any other specifications? 
 customer: My depart time should be in the evening and my return time should be in the morning. 
 agent: Ok, please wait for a moment. 
 customer: Sure. 
 agent: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions. 
 customer: That's ok, I will choose any other source to reach my destination. 
 agent: Ok. Thank you for availing us. 
 customer: Thank you for searching the flights.
Solution:
no_flight