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

[EX Q]: customer: Hello. I am Dennis Campbell. 
 agent: Hello, how can I help you today? 
 customer: I am planning to attend music concert at OAK, can you please help me with booking a flight ticket from EWR? 
 agent: Sure, may I know your planned travel dates? 
 customer: Sure, I would like to take off on Feb 22 and return on Feb 24. 
 agent: Is there any class preference for you? 
 customer: No, but I would like to return during evening time. 
 agent: Do you have any other specifications? 
 customer: I need a flight with 1 connection. 
 agent: Sorry to say that, no flights were found with your given details. 
 customer: Ok, no issues. Thank you for checking. 
 agent: Thank you for reaching us. 
 customer: You are welcome.
[EX A]: no_flight

[EX Q]: customer: Hi. 
 agent: Hello, how may I help yo today? 
 customer: Stephen Harris here. Please help me out in booking the ticket from MSP to EWR. 
 agent: Sure, can you please mention with your dates of journey? 
 customer: My trip dates will be Mar 27 to Mar 29. 
 agent: Ok, may I know your airline preference please? 
 customer: No. 
 agent: May I know your class preference please? 
 customer: Business class. 
 agent: Please wait for a mean while. 
 customer: Ok. 
 agent: Sorry Stephen, there is no flight found as per your travelling details. 
 customer: That's ok, thank you. 
 agent: You are welcome.
[EX A]: no_flight

[EX Q]: customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: I am looking for a flight from OAK to IAH, can you please help me in booking? 
 agent: Sure, can you please share your journey dates that you prefer to travel? 
 customer: My travelling dates are Oct 22 and Oct 24. 
 agent: Do you require any stopovers in your journey? 
 customer: I need a stopover in between my journey. 
 agent:  Would you let us know if you have any other preferences? 
 customer: I prefer an economy class. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: There is a flight with your requirement, airline is SouthWest Airlines with price 100 and single connection. 
 customer: Please proceed. 
 agent: Please share your name. 
 customer: My name is Benjamin Miller. 
 agent: Your booking is done and flight number is 1024 in economy class. 
 customer: Thank you for booking. 
 agent: Thanks for reaching us.
[EX A]:
book