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
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Question: customer: Hello, my name is Katherine Miller. 
 agent: Hello, Katherine Miller. How can I assist you? 
 customer: I am planning to spend my vacation holidays with my brother, so I need to make a flight reservation. 
 agent: OK, what is your exact destination and when do you want to go? 
 customer: My destination airport is PA-PHL, and my travelling dates are departure on 03/20 and arrival on 03/22. 
 agent: Let me know your source point. 
 customer: My source airport is San Francisco, CA-SFO. 
 agent: Sorry to inform, no flights are found regarding to your specifications. 
 customer: That's not a problem, thanks for your information. 
 agent: Thanks for choosing us. Have a great day.

Answer: no_flight


Question: customer: Hi. 
 agent: Hello. How may I assist you? 
 customer: I am looking for a direct flight from JFK to DTW, can you please help me to book my flight ticket? 
 agent: Sure, I am here to help you out. May I know your travelling dates please? 
 customer: Sure, I will depart on Jan 5th and I want to return back on Jan 7th. 
 agent: How much you can afford for airfare? 
 customer: I can only afford 500. 
 agent: Wait a moment please. 
 customer: Sure. 
 agent: May I know your name pleas to proceed further? 
 customer: Sure, my name is Catherine Mitchell. 
 agent: Catherine Mitchell, there are no flights available in you route. 
 customer: Not an issue, I will find an other way to reach my destination. Anyway, thank you. 
 agent: Thank you for choosing us.

Answer: no_flight


Question: customer: Hello. 
 agent: Hello, what can I aid you at this moment? 
 customer: I am Donald Baker from Denver. I want to go to New York next week, can you please book a flight ticket for me on 04/29? 
 agent: I am glad to help you about your flight ticket booking Baker. Can you please provide your respective location codes of journey? 
 customer: Thank you, I want to take off from DEN and destination airport is LGA. 
 agent: Would you like to have a return journey? If so please provide your return date. 
 customer: Yes, please book my return ticket also on 05/01. 
 agent: Hold on for sometime. 
 customer: Ok. 
 agent: There is a flight with single stopover having a ticket fare of 300 which is provided by AA airlines. Would you like to book this flight ticket? 
 customer: Please proceed. 
 agent: I have booked your flight ticket with flight 1006 in an economy class. 
 customer: Thank you for your help. 
 agent: Most welcome, thank you for employing our service. Have a safe journey.

Answer:
book