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: Hi. 
 agent: Hello. 
 customer: Myself Elizabeth Lopez. 
 agent: What service that you are looking from our agency? 
 customer: There is a urgent business meeting at Houston. Can you please help me in booking the ticket from IAD to HOU? 
 agent: Sure, I am oblige to help you with that. Can you please provide your preferable dates of travelling? 
 customer: I will take-off 03/21 and again I will be return back on 03/23. 
 agent: Please wait a moment to check the flights availability in your route. 
 customer: Sure. 
 agent: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 is provided by JetBlue airlines. Shall I proceed with this? 
 customer: Yes, please proceed with that. 
 agent: Ok, your ticket has been confirmed in flight number 1000. 
 customer: Thank you very much for reserving the ticket. 
 agent: Thank you for reaching us, hope you have a great journey.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello. How may I help you? 
 customer: Katherine Perez here. Owing an emergency, I want to cancel my recent reservation. Can you please help me? 
 agent: Sure, I will help you in cancelling your ticket. Ok, please wait a moment. 
 customer: Ok, take your time. 
 agent: Thank you for waiting. 
 customer: My pleasure. 
 agent: Sorry, there are no reservations found on this name. Thank you for choosing our services. 
 customer: Thank you for your information.
Example Output: no_reservation

Example Input: customer: Hello, I am Scott Garcia. 
 agent: Hello, how can I help you? 
 customer: As my plan for visiting Denver was cancelled, So I want to cancel my  recent reservation. Would you please help me out? 
 agent: Sure, I am happy to help you. Please be on hold, I will check the status and revert you. 
 customer: Sure. 
 agent: Thank you for your time, There is no reservation found on your name. 
 customer: No problem, thank you for the information. 
 agent: Thank you for contacting us.
Example Output:
no_reservation