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: Hi. 
 agent: Hello. How can I assist you at this moment? 
 customer: Please make a reservation with the name of Nicole Martin from PHX. 
 agent: Sure, I will assist you with that. Can you please mention your preferable travel dates? 
 customer: I want to travel on Dec 20 and return back on Dec 22. 
 agent: May I know your destination airport code name? 
 customer: Destination airport code is BOS. 
 agent: May I know your connection limit for this trip? 
 customer: I need a single connecting flight. 
 agent: Do you have any another specifications? 
 customer: I prefer to travel in economy class. 
 agent: Is there any additional preferences do you have? 
 customer: No. 
 agent: Ok, please hold on a moment. 
 customer: Sure. 
 agent: AA flight available with connection limit 1 and fare is 100, shall I confirm this economy class flight? 
 customer: Yes, please confirm it. 
 agent: Your flight ticket is booked successfully, flight number is 1026. 
 customer: Thank you for the help. 
 agent: You are welcome Nicole Martin.
[A]: book


[Q]: customer: Hello. 
 agent: Hello. How may I assist you today? 
 customer: Due to some problems my trip was cancelled so can you please cancel my flight ticket? 
 agent: Sure, may I know your name? 
 customer: Sure, my name is Edward Brown. 
 agent: Sorry, there is no active reservation on your name. 
 customer: Oh! It's ok, no problem. Thank you for your information. 
 agent: Thank you.
[A]: no_reservation


[Q]: customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: I am Kenneth Lee. Will you please help me to book a flight ticket from IAH to PHL? 
 agent: Sure, can you help me with your journey dates to search the flight? 
 customer: My journey dates are 04/16 and 04/18. 
 agent: There is a flight-1011 from UA airlines, shall I proceed? 
 customer: If the flight is with connection limit 1,then only proceed with the booking process. 
 agent: Ok, your booking is done. 
 customer: Thank you very much. 
 agent: Welcome.
[A]:
book