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

Ex Input:
customer: Hi. 
 agent: Hello. 
 customer: I am Mary Martin. 
 agent: How can I help you? 
 customer: Can you please reserve me a flight ticket from Washington, DC - IAD to Austin, TX - AUS? 
 agent: Sure, I am glad to help you. Could you please share your travelling dates? 
 customer: My trip dates are 04/25 - 04/27. 
 agent: Thank you for waiting, there are no flights found on your preferable dates. 
 customer: Not a problem, thank you. 
 agent: Thank you for choosing us.

Ex Output:
no_flight


Ex Input:
customer: Hello, I am Betty Campbell. 
 agent:  Hello, How exactly I can serve you the best today? 
 customer: Can you help me to book a direct flight from LGA - OAK? 
 agent: Sure, I will help you with that. 
 customer: Thanks. 
 agent: Kindly, mention your travelling dates? 
 customer: My travelling dates are 07/26 and 07/28. 
 agent:  Ok, please wait a moment, let me search a flight for you. 
 customer: Sure. 
 agent: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions. 
 customer: Ok, no issues. Thank you. 
 agent: Thank you for choosing us.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello, how can I assist you? 
 customer: Please help me in booking flight ticket from EWR to IAD. 
 agent: Sure, I can help you with that. May I know your travel dates please? 
 customer: My trip dates are Jan 04 to Jan 06. 
 agent: Do you need break in between your journey? 
 customer: I need a connecting flight. 
 agent: Please let me know if you have any other specifications. 
 customer: My depart should be in afternoon. 
 agent: May I know your good name please? 
 customer: Jessica Evans. 
 agent: Delta airlines is providing a direct flight with ticket fare of 600, shall I proceed for booking? 
 customer: You can proceed. 
 agent: I have successfully booked you an economy class ticket in flight-1008, have a safe journey. 
 customer: Thank you. 
 agent: Thank you for choosing us.

Ex Output:
book