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, 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.
[A]: no_flight


[Q]: customer: Hello. 
 agent: Hello. 
 customer: I am Timothy Martin. 
 agent: How may I help you? 
 customer: I need to book a flight ticket from New York, NY-EWR to Boston, MA-BOS. 
 agent: Sure, help me with the travel dates? 
 customer: I want to travel on dates 10/16 and 10/18. 
 agent: We do not found any flights running in your preferred routes. 
 customer: No problem, thank you for your help. 
 agent: Thank you for opting us.
[A]: no_flight


[Q]: customer: Hello, I am Nancy Roberts. 
 agent: Hello, how can I help you? 
 customer: I need a direct flight to attend my Sister's Baby Shower Function in New York. Can you book a flight ticket? 
 agent: Sure, we are here to help you. 
 customer: Thank you. 
 agent: Let me know when you are willing to travel? 
 customer: I wish to start my journey on 10/06 and end on 10/08. 
 agent: Can you share me your source point and destination point? 
 customer: Sure, my origin is from New York, NY - EWR and I want to reach to NY - LGA. 
 agent: Do you need any halts in between your journey? 
 customer: I already mentioned above. 
 agent: Ok, wait for some time. 
 customer: Sure. 
 agent: Thanks for waiting there is no flights found on your details. 
 customer: Thanks. 
 agent: Thanks for approaching us.
[A]:
no_flight