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: Hello. 
 agent: Hello. How may I assist you today? 
 customer: I have to change my reservation due to my planned my trip got postponed. So please help me with that. 
 agent: Sure, may I know your name? 
 customer: Thank you. Please check my reservation with my name Rebecca Gonzalez. 
 agent: Please wait a moment. 
 customer: Sure, take your time. 
 agent: Sorry, there are no active reservations to change your trip. 
 customer: Oh! It may not be booked properly. Anyway, thank you for your time. 
 agent: Thank you for reaching our service. 
 customer: Most welcome.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I help you? 
 customer: I am Betty Williams, help me to book a flight ticket on 08/18 to meet my step father at Philadelphia. Can you book a return ticket on 08/20? 
 agent: Sues, may I know your price limit for this journey? 
 customer: My budget is 5000 for flight ticket. 
 agent: Ok, please provide me your airport codes. 
 customer: I will fly from Orlando, FL-MCO to PA-PHL. 
 agent: Ok, let me check the availability on your route. 
 customer: Sure. 
 agent: Betty, Frontier airline is available with price 100 with single connection. Shall I proceed? 
 customer: Sure. 
 agent: Reservation has been done in 1028 flight. 
 customer: Thank you for helping me with booking. 
 agent: Thank you for opting us.

Output: book


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I assist you? 
 customer: I am Charles Williams. I need a direct flight to visit a The Mirage Restaurant in Las Vegas, can you assist me for booking a flight ticket? 
 agent: Sure, I will assist you in ticket booking. Please provide your travel dates and price limit? 
 customer: My travelling dates are from 07/04 to 07/06. My price limit should not exceed with 200. 
 agent: Ok, let me know your source and destination point? 
 customer: It is an round trip, my source and destination is Las Vegas, NV - LAS. 
 agent: Ok. Sorry to inform you that there was no flights found on your dates. 
 customer: Ok, no issue. Thanks for your quick response. 
 agent: Thank you for opting us, have a good day.
Output: no_flight