Instructions: 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. 
 customer: I am Paul Martin. 
 agent: How may I guide you today? 
 customer: I want to book a ticket from DTW to DTW to attend seminar, can you help me? 
 agent: Sure, I will help you with that. Can you please share your preferable journey dates? 
 customer: I am departing on 03/13 and return on 03/15. 
 agent: Please wait for a minute. 
 customer: Sure. 
 agent: I found a ticket for you with price of 200, flight number is 1004 and connection is 1. 
 customer: Please proceed for booking. 
 agent: Is it ok for you? I confirmed your ticket successfully. 
 customer: Thank you for your help. 
 agent: Thank you for reaching us.
Output:
book