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: Consider Input: customer: Hi. 
 agent: Hello, how may I guide you? 
 customer: I am Patricia Brown here, I want to reserve my ticket from LAS to ATL, can you please help me? 
 agent: Sure, can I know your preferable dates? 
 customer: Sure, my planned dates of journey are from 11/26 to 11/28. 
 agent: I found a direct flight 1002 of Frontier airlines matches with your preferences, can I proceed? 
 customer: Ok, you can book it. 
 agent: Your ticket is booked. 
 customer: Thank you for your help in booking my ticket. 
 agent: Thank you, have a good day.

Output: book


Input: Consider Input: customer: Hello, I am Shirley Martinez. 
 agent: Hello, how can I serve your today? 
 customer: I want to visit HOU from my hometown PHL, can you help me with single connection of flight? 
 agent: Sure, may I know your travelling dates? 
 customer: My depart is on 04/26 and return on 04/28. 
 agent: please mention your connections. 
 customer: I need a lay by in between journey. 
 agent: There is a Frontier 1002 with fare of 100 which matches your travelling dates. Shall I proceed with booking? 
 customer: OK, proceed with booking. 
 agent: Your booking has been confirmed on name of Shirley Martinez. 
 customer: Thank you for the help. 
 agent: Thank you for approaching us.

Output: book


Input: Consider 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