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. 
 agent: Hello, how may I aid you today? 
 customer: My self David Lewis, I need to schedule my trip to Chicago for next week. Could you please help me ion booking the ticket from BOS to ORD? 
 agent: Sure, I am here to help you out. May I know your travel dates? 
 customer: I will take-off 07/11 and again I will be return back on 07/13. 
 agent: Ok, please wait for a while. 
 customer: Sure, I will wait for your response. 
 agent: Thank you for waiting. Sorry Lewis, there are no flights available. 
 customer: Not an issue, anyhow thank you very much for your help.

Answer: no_flight


Question: customer: Hello, I am Dennis Mitchell. 
 agent: Hello,Mitchell. How shall I guide you? 
 customer: My business meeting has been postponed, so I want to change my existing reservation. Can you guide me for changing an reservation? 
 agent: Definitely,let me check. 
 customer: Sure. 
 agent: Sorry,no reservation has found on your name. 
 customer: Ok, no problem. Thanks for your service. 
 agent: Thank you for approaching us.

Answer: no_reservation


Question: customer: Hi. 
 agent: Hello, how can I help you today? 
 customer: I am Catherine Wright. Can you please help me in booking a flight ticket from PHX to JFK to attend a music festival? 
 agent: Sure, we are here to help you. Can you share me your travelling dates? 
 customer: Thank you. I am planning to depart on Mar 19 and return on Mar 21. 
 agent: Do you need any halt in between your journey? 
 customer: No, I need a direct flight. 
 agent: Ok, wait for some time. 
 customer: Sure. 
 agent: Thanks for waiting there are no flights found on your details. 
 customer: Ok, no problem. Thank you for the information. 
 agent: Thanks for approaching us.

Answer:
no_flight