Definition: 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: customer: Hello. 
 agent: Hello, how may I be your helping hand? 
 customer: Can you please help me in reserving my flight from CLT to reach JFK? 
 agent: Sure, may I know your good name, please? 
 customer: Sure, my good name is Margaret Lewis. 
 agent: On which dates are you going to travel? 
 customer: My planned travel dates are May 20th and May 22nd. 
 agent: Do you have any preferences? 
 customer: I don't have any other preferences. 
 agent: Wait a minute. 
 customer: Ok, sure. 
 agent: We found a flight of Spirit airline, flight number 1009 with the fare of 100 and with 2 connections. Can I proceed? 
 customer: Sorry, I need a direct flight. 
 agent: Ok, wait a minute let check the direct flight. 
 customer: Ok, sure. 
 agent: We found a direct flight on United airline, flight number 1020 and price is 200. 
 customer: Ok, please confirm it. 
 agent: Your ticket has been booked. 
 customer: Thanks for the great service. 
 agent: Thank you for approaching us. Have a nice day.
Output:
book