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 Christopher Edwards. 
 agent: How may I guide you today? 
 customer: Can you help me to find a flight from MSP to IAD? 
 agent: Sure, I will help you with that. Can you please share your preferable journey dates? 
 customer: My travelling dates are July, 15 and July, 17. 
 agent: Do you have any specifications? I am sorry to say that there is no reservation found under your details. 
 customer: That's fine, thanks for your information. 
 agent: Thank you for reaching us.
[A]: no_flight


[Q]: customer: Hello. 
 agent: Hello, how may I help you? 
 customer: I am Mary Lee, want to travel from LAX to ATL. 
 agent: May I know your trip dates? 
 customer: My trip dates are from 08/27 to 08/29. 
 agent: In Frontier airline, there is a flight for you with 1 connection and fare is 100. Shall I proceed? 
 customer: Yes, please. 
 agent: Your ticket is booked. 
 customer: Thank you. 
 agent: Most welcome.
[A]:
book