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 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