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

Example Input: customer: Hello,. 
 agent: Hello, how can I aid you? 
 customer: I am Charles Miller. I am planning to go for Yosemite Adventure with my friends at Detroit, can you please book a ticket under the price 5000? 
 agent: Sure, can you share your trip dates? 
 customer: I want to travel on 04/26, and need to catch return flight on 04/28. 
 agent: Do you need any halt in between your journey? 
 customer: I need a halt. 
 agent: May I know your journey airport codes? 
 customer:  I need to leave from my nearest airport HOU to reach DTW. 
 agent: Give me a minute. 
 customer: Sure. 
 agent: There is a connecting flight with number 1013 in airline Southwest, the fare is 100. Can I book it? 
 customer: Proceed with the booking. 
 agent: Your ticket is reserved. 
 customer: Thanks for the help. 
 agent: Thank you for opting us.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello. How can I assist you at this moment? 
 customer: I am Pamela Walker here. I am planning to visit a Houston city to meet my grandfather in IAH from LAS. Can you find a flight ticket for me? 
 agent: Sure Pamela Walker, I will help you with that. Can I have your travel dates please? 
 customer: Ok, my preferable dates are on 12/19 and back on 12/21. 
 agent: Ok Pamela Walker, please wait a moment to check flight availability. 
 customer: Sure. 
 agent: AA airlines running a flight in your route with connection 1 and the fare of the ticket is 200. Shall I proceed with booking? 
 customer: Yes, you can reserve the ticket. 
 agent: Ok Pamela Walker, your ticket booking has done and the flight number is 1021. 
 customer: Thank you for spending your time. 
 agent: Thank you for choosing us, have a great journey.
Example Output: book

Example Input: customer: Hello, I am Richard Jackson. 
 agent: Hello, how may I support you now? 
 customer: As my schedule of attending an press conference got postponed. Can you please help me in changing my existing reservation? 
 agent: Sure, we are here to help you. Please wait a minute, I will check and get back to you. 
 customer: Ok. 
 agent: Thank you for waiting, there were no reservation matches with given name. 
 customer: Ok, Thank you for your information. 
 agent: Thank you for availing us.
Example Output:
no_reservation