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. 
 customer: I am David Parker. 
 agent: How can I assist you for the day? 
 customer: I am planning to visit New York, can you please book me the ticket from OAK to JFK? 
 agent:  Sure, I am here to help you with that flight ticket booking. May I know your  preferable travel dates, please? 
 customer: My preferable journey dates are from 11/10 to 11/12. 
 agent: Sorry to tell you that, there are no flights available as per your given travel dates. 
 customer: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information. 
 agent: You are welcome, thank you for approaching us.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I assist you for the day? 
 customer: I would like to meet my old friend at Las Vegas, please help me in booking a ticket from IAH to LAS. 
 agent: When you are willing to travel? 
 customer: My planned travel dates are on Mar 11 and Mar 13. 
 agent: Do you have any connection limit? 
 customer: I need a direct flight for this trip. 
 agent: May, I know your good name? 
 customer: My name is Jessica Wilson. 
 agent: Do you have any other specifications? 
 customer: No more specifications, please find the availability of flights. 
 agent: Sorry, we found no flights on your given dates. 
 customer: Ok, no issues. Thank you for your information. 
 agent: Thank you for reaching us.

Output: no_flight


Input: Consider Input: customer: HI. 
 agent: Hello, how can we assist you? 
 customer: Due to heavy cyclone at my location, I'm unable to catch the flight. Can you please help me in cancellation of my ticket? 
 agent: Sure, we here to help you. Can you provide your name on which the ticket is been booked? 
 customer: I have booked the ticket on the name of Cynthia Lee. 
 agent: Ok Cynthia Lee, can you please hold on for a moment? 
 customer: Sure. 
 agent: As per the records there no reservation found on the name provided. 
 customer: That's ok, may be I have done a wrong booking. Thank you anyways. 
 agent: Thank you for choosing our agency.
Output: no_reservation