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 best can I guide you for the day? 
 customer: I need you to cancel my recently booked flight ticket. 
 agent: Sure, please hold a moment. 
 customer: Ok, I will. 
 agent: We need your good name to check the reservation. 
 customer: Ok, my name is Deborah Robinson. 
 agent: Thank you for sharing your good name, we found a reservation on your name and it has been cancelled. 
 customer: Great! Thanks for your help. 
 agent: Thank you.
Example Output: cancel

Example Input: customer: Hello. 
 agent: Hello. 
 customer: I am Alexander Perez. 
 agent: How may I be at your service today? 
 customer: I would like to book a flight ticket. 
 agent: Sure, I can help you over that. Where are you travelling to? 
 customer: I am travelling to Chicago, IL - ORD. 
 agent: Ok, on what date will be travelling? 
 customer: I will be planning to travel on 11/18 date. 
 agent: Ok, would you prefer for return journey also? 
 customer: Yes, I will like to have a return journey also. My return journey date is 11/20. 
 agent: That's fine, can you share your current location airport code to get a flight for you? 
 customer:  Sure, I can share you my current location. My current location is Boston, MA - BOS. 
 agent: There is a flight-1007 of UA airline, is it ok for you? 
 customer: Ok, please proceed. 
 agent: Ok, your ticket has been done with your name. 
 customer: Thank you. 
 agent: Welcome, have a nice day.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello, how may I help you? 
 customer: Myself Mark Brown here. I  need to fly Las Vegas for my college admission, could you please help me in booking my flight ticket from ATL to LAS? 
 agent: Sure, can you please let me know your journey dates that you wish to travel? 
 customer: My travel dates are 11/11 and 11/13. 
 agent: Do you need a flag stop in between your journey? 
 customer: I need a connecting flight. 
 agent: May I know how much do you want to spend on flight ticket? 
 customer:  I can spend upto 500. 
 agent: Please wait for a while. 
 customer: OK. 
 agent: We found a flight in Southwest airlines, flight number is 1005 with one connection price is 100. Shall I proceed? 
 customer: Ok, you can proceed. 
 agent: Ok, your ticket has been confirmed in economy class. 
 customer:  Thank you for booking. 
 agent: Thank you for opting us.
Example Output:
book