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

[Q]: customer: Hello, I am Ryan Anderson. 
 agent: Hello, how may I aid you at this moment? 
 customer: I would like to go to a beach in Washington, so could you please book a ticket for me? 
 agent: Can I have your journey dates? 
 customer: I would like to go on 02/03 and return back on 02/05. 
 agent: Please send your nearby airport codes. 
 customer: My airport codes are PHX and DCA. 
 agent: Please wait for a moment. 
 customer: Ok, ensure it is a single connecting flight. 
 agent: Sorry, no flights are running on those dates. 
 customer: That's ok, thank you for checking. 
 agent: Thank you for reaching us. 
 customer: Welcome.
[A]: no_flight


[Q]: customer: Hi. 
 agent: Hello. How can I assist you? 
 customer: I am Edward Nelson. I want to change my existing reservation? Can you help me out? 
 agent: Sure, Edward. Please wait a minute. 
 customer: Sure. 
 agent: Edward, there is no reservation available with your details. 
 customer: Oh! that's fine. 
 agent: Thank you for contacting us. 
 customer: Thank you for your search.
[A]: no_reservation


[Q]: customer: Hello. 
 agent: Hello. How can I assist you at this moment? 
 customer: Can you book a ticket from CLT to BOS? As I need to attend a conference. 
 agent: Sure. Can you please mention your preferable travel dates? 
 customer: Sure, my planned departure and return travel dates are 3rd and 5th of October. 
 agent: May I know your name for further process? 
 customer: Yes, my name is Gary Davis. 
 agent: Do you have any another specifications? 
 customer: Yes, I'm looking for single connected flight. 
 agent: Ok, please hold on a moment. 
 customer: Sure, I'll be online. 
 agent: Spirit airline flight available with connection limit 1 and fare is 100, shall I confirm this economy class flight? 
 customer: That's fine, you can proceed for booking the ticket. 
 agent: Your flight ticket is booked successfully, flight number is 1003. 
 customer: Thank you so much for your help. 
 agent: You are welcome Gary Davis.
[A]:
book