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 may I be at your service today? 
 customer: I have to attend a Live Concert at Seattle, could you please help me with booking a flight ticket from HOU to SEA? 
 agent: Sure, I will help you in booking the ticket. May I know your travelling dates please? 
 customer: I would like to depart on Apr 4th and return on Apr 6th. 
 agent: Do you have any other specifications? 
 customer: I am looking for a connecting flight. 
 agent: Please help me with your name for booking. 
 customer: I am Nancy Scott. 
 agent: Sorry for this inconvenience, I could not find any flight with your requirements. 
 customer: Ok, not an issue. 
 agent: Thank you for reaching us. 
 customer: Anyways, thank you for the information.

Ex Output:
no_flight


Ex Input:
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.

Ex Output:
no_reservation


Ex Input:
customer: Hello. I am Nancy Hall. 
 agent: Hello, how may I assist you at this moment? 
 customer: I want to travel from DFW to IAH. Can you help me to book a flight ticket? 
 agent: Sure, I am here to help you in booking. Kindly provide your travel dates to reserve a flight. 
 customer: I want to fly in the flight on 04/01 and 04/03. 
 agent: Ok, please be on hold, let me check for the flight availability. 
 customer: Ok, take your own time. 
 agent: Hawaiian airlines is having a flight with a single halt and ticket fare is 100, shall I proceed with booking? 
 customer: Proceed to booking. 
 agent: Ok, your ticket has been reserved with the flight-1006. 
 customer: Thank you for your help. 
 agent: Welcome, have a happy journey.

Ex Output:
book