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 serve you? 
 customer: I am Raymond Allen. I want to change an existing reservation, due to my health issues. Could you help me in changing the reservation? 
 agent: Sure, I can help you. Please wait a while. 
 customer: Sure. 
 agent: Thanks for being waiting. We didn't found any reservation by this name. 
 customer: Not an issue. Thank you. 
 agent: Thank you.

Ex Output:
no_reservation


Ex Input:
customer: Hello. 
 agent: Hello. How can I help you? 
 customer: I am Gregory Allen. I want to attend a live music concert in EWr, can you please find a flight from ORD? 
 agent: Sure, I will help you to book a flight. Can you please share me your travelling dates? 
 customer: I want to start my journey on 10/10 and my return will be on 10/12. 
 agent: Please hold on for a moment. 
 customer: Ok, take your time. 
 agent: Here, I found a flight for you with single connection. Shall I proceed for booking? 
 customer: Please proceed. 
 agent: Your ticket is booked with flight number 1000 and airline is Southwest. 
 customer: Thank you for booking.

Ex Output:
book


Ex Input:
customer: Hi,. 
 agent: Hello, how can I assist you now? 
 customer: Please book a ticket from Houston, TX-HOU to New York, NY-LGA. 
 agent: Sure, please share me your planned journey dates? 
 customer: Departure is on 03/05 and 03/07 is my return date. 
 agent: Please mention your connection limit? 
 customer: Connections limit is 1. 
 agent: Please wait for a moment. 
 customer: Sure. 
 agent: Thanks for waiting, there is a connecting flight of airline Frontier, flight number is 1015 and fare is 100,. Shall I proceed with booking? 
 customer: Please book a ticket. 
 agent: Your booking has been done. 
 customer: I am Michelle Adams. Thanks.

Ex Output:
book