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: Hello. 
 agent: Hello. How can I help you? 
 customer: I am planning to visit CLT to attend business meeting, can you please help me in booking a flight ticket from HOU? 
 agent: Your trip dates please. 
 customer: My trip dates are May 6 and May 8. 
 agent: Do you have any connection limit? 
 customer: Yes, I need a connecting flight. 
 agent: Do you have any other preferences? 
 customer: Yes, I prefer to depart during evening and please look for an economy class. 
 agent: Your name please. 
 customer: Edward Martin here. 
 agent: Sorry to say that, there are no flights found with your details. 
 customer: Not an issue, anyway thank you for checking. 
 agent: Thank you for reaching us.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello. How may I assist you today? 
 customer: Can you help me in booking a flight ticket form LAS to BOS? 
 agent: Sure, I am gleeful to help you with that. May I know your planned journey dates? 
 customer: I want to travel on 09/04, and return on 09/06. 
 agent: Do you have any other specification? 
 customer: I need a break in my journey. 
 agent: May I know your name please? 
 customer: I am Joshua Scott. 
 agent: Sorry to say that, there are no flights found on this route as per your details. 
 customer: Ok, no issues. 
 agent: Thank you for reaching us, have a great day. 
 customer: Thanks for the information.

Ex Output:
no_flight


Ex Input:
customer: Hello, I am Nancy Miller. 
 agent: Hello, how may I support you? 
 customer: After completion of Inauguration day in New York, I am planning to visit Minneapolis & St. Paul. Can you please book me a ticket with fare of 200? 
 agent: Sure, We are happy to help you. Can you please share your travel dates? 
 customer: I would like to start on 01/21 and return on 01/23. 
 agent: May I know your connection limit? 
 customer: I need single connection. 
 agent: Please provide your airport codes? 
 customer: My airport codes are from NY-JFK to MN-MSP. 
 agent: Ok, please give me a moment. 
 customer: Sure. 
 agent: Thanks for your valuable time. We found a flight with Frontier airlines and flight number is 1026. Fare is 200 having a connection. Shall I book this ticket? 
 customer: That's Frontier airline is perfect for me, you can proceed for booking. 
 agent: Your ticket has been confirmed. 
 customer: Thanks for your help. 
 agent: Thank you for opting our service. Wish you a happy journey.

Ex Output:
book