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

Example Input: customer: Hello. 
 agent: Hello. How can I help you? 
 customer: I am George Evans. I want to change my existing reservation due to postpone of my trip. Could you please help me? 
 agent: Sure, just a moment please. 
 customer: Sure. 
 agent: I am sorry no reservation found on your name. 
 customer: No worries, thank you for the information. 
 agent: Thank you for choosing us.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello. 
 customer: I am Steven Roberts. 
 agent: How may I help you? 
 customer: Can you please help me in booking a flight ticket from DCA to IAD? 
 agent: Sure, I will help you in booking the ticket. May I know your travelling dates please? 
 customer: My travelling dates are Jan 18th and Jan 20th. 
 agent: Do you have any other specifications? 
 customer: The depart time should be morning. 
 agent: Sorry for this inconvenience, I could not find any flight with your requirements. 
 customer: Ok, not an issue. Thank you. 
 agent: Thank you for reaching us.
Example Output: no_flight

Example Input: customer: Hi. 
 agent: Hello. 
 customer: Jason Adams here. 
 agent: How can I assist you today? 
 customer: I have to attend a Live Concert at Atlanta, could you please help me with booking a flight ticket from AUS to ATL? 
 agent: Sure, can you please share your travel dates? 
 customer: Ok, my preferred travel dates are from 07/10 to 07/12. 
 agent: Let me check for the availability of flight. Jason, there is a flight available with price 100 and the connection is 1 with AA airline. Would you like me to proceed with the booking? 
 customer: Ok, please proceed for booking. 
 agent: Your booking is confirmed with 1019 flight number. 
 customer: Thank you so much. 
 agent: Thank you for reaching us, have a great day.
Example Output:
book