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

Input: Consider Input: customer: Hello. 
 agent: Hello. How may I assist you? 
 customer: My name is Anthony Scott. Owing to an emergency, I want to cancel my reservation. 
 agent: Sure, I will help you. Please wait for a while. 
 customer: Sure. 
 agent: Thanks for waiting. There was no reservation found on your name. 
 customer: No problem, thank you for your help. 
 agent: Thank you for choosing us.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I help you? 
 customer: I want to cancel my recent reservation. Can you please help me in that? 
 agent: Sure, I can help you with that. May I know your good name please? 
 customer: Larry Robinson here. 
 agent: Please wait while I'll check your reservation status. 
 customer: Ok. 
 agent: Larry Robinson, there is no active reservation found under your name to do cancellation. 
 customer: Ok, no problem. Thank you. 
 agent: Thank you for choosing us.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I help you? 
 customer: I am Edward Edwards, want to travel from CLT to DFW. Please help me in booking my flight ticket. 
 agent: Sure, may i know your travelling details? 
 customer: Sure, my travelling dates are from 05/26 to 05/28. 
 agent: There is a flight which can travel to your region having a single lay out in between your journey having a ticket fare of 100 which is provided by Delta airlines. Would you like to book this flight for your journey? 
 customer: Yes, please proceed with the booking. 
 agent: Ok, your ticket is confirmed with the flight number 1000. 
 customer: Thank you for your help. 
 agent: Most welcome.
Output: book