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 Input:
customer: Hi. 
 agent: Hello, how may I aid you? 
 customer: Joseph Garcia here. I would like to spend some more days with my family, so please help me in changing my existing reservation. 
 agent: Sure, I am here to help you out. Please allow me a moment. 
 customer: Ok. 
 agent: Sorry  Joseph Garcia, there is no active reservation on your name in our database. 
 customer: That's ok, thank you for your help. 
 agent: Thank you for reaching us.

Ex Output:
no_reservation


Ex Input:
customer: Hello, I am Michelle Thompson. 
 agent: Hello, how may I help you at this moment? 
 customer: I would like to visit Disney Land in San Francisco, so could you please book a ticket for me? 
 agent: Can I have your journey dates? 
 customer: Sure, I would like to go on 12/11 and return back on 12/13. 
 agent: May I know your nearby airport codes? 
 customer: My source and destination airport codes are LGA and SFO. 
 agent: Please wait for a moment. 
 customer: Ok, ensure it is a single connecting flight. 
 agent: There is a connecting flight available with Spirit airline, shall I book it? 
 customer: Ok, please proceed for further. 
 agent: Your booking is done with flight number 1009. Happy journey. 
 customer: Thank you for booking. 
 agent: Welcome. Thank you for opting us. 
 customer: Welcome.

Ex Output:
book


Ex Input:
customer: Hello. 
 agent: Hello. What help that you need from my end? 
 customer: I need a direct flight for my journey to PHL from PHX to attend a client meeting. Can you help me in booking my flight ticket? 
 agent: Sure, I am glad to help you and I need your travel dates to book a flight ticket. Can you please provide it? 
 customer: Thank you for considering my request. My travel dates are June 30 and July 02. 
 agent: Do you have any other specification that you would like to mention? 
 customer: No. 
 agent: Be on hold for a moment. 
 customer: Sure. 
 agent: Can I know your name please? 
 customer: Sure, my name is Angela Parker. 
 agent: I regret to inform you that there is no flight obtained on your travel dates and locations to book the ticket. 
 customer: No issue with that, anyways thank you for checking me the flight. 
 agent: Thank you for reaching us and next time we can serve you better, most welcome.

Ex Output:
no_flight