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, how can I help you? 
 customer: Help me in booking a flight from EWR to IAH? 
 agent: Sure, I am happy to help you. Can you please help me with your travelling dates? 
 customer: I like to travel on Sept 19 to 21. 
 agent: Do you prefer any stopover in between journey? 
 customer: I prefer to travel in single connection flight. 
 agent: Are there any other specifications for you? 
 customer: No. 
 agent: May I know your good name? 
 customer: I am Matthew Walker. 
 agent: American Airlines is providing connecting flight with the ticket fare of 200 and depart time is 0:00 hours, arrival time is 17:00 hours. Shall I proceed? 
 customer: Proceed for booking. 
 agent: Ok, your ticket is reserved in an economy class and the flight number is 1002. 
 customer: Thank you very much. 
 agent: Thank you for choosing us.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello. How can I aid you today? 
 customer: I need to book a connecting flight with the normal-cost airlines. Can you help me with that? 
 agent: Sure, I am here to help you with that flight ticket booking. May I know your travelling dates? 
 customer: Thank you for considering my request. My travelling dates are June 27 and June 29. 
 agent: May I know your name please? 
 customer: My name is Deborah Adams. 
 agent: Is there any airline preference? 
 customer: I have mentioned you already. 
 agent: May I know your preferable airport codes, please? 
 customer: Sure, my airport codes are HOU and PHL. 
 agent: Do you have any other specifications? 
 customer: No. 
 agent: Please wait for a whils. 
 customer: Sure. 
 agent: There are no flights on this route as per your details. 
 customer: Not a problem, anyways thank you for the information. 
 agent: Thank you for reaching us, have a great day.
Example Output: no_flight

Example Input: customer: Hi. I am Andrew Hill. 
 agent: Hello, how can I support you? 
 customer: I want to go for Death Valley Adventure at Seattle. Can you help me in my booking? 
 agent: Sure. Help me with your travelling dates please. 
 customer: I will start my journey on 01/14. I will return back on 01/16. 
 agent: Can I know your airport codes? 
 customer: My source airport code is Phoenix, AZ - PHX. My destination is Seattle, WA - SEA. 
 agent: Do you have any specifications? 
 customer: I need a halt in my journey. I can pay up to 1000 for this flight ticket. 
 agent: Please hold on for a while, I will check the availability of flights and revert to you. 
 customer: Sure, take your time. 
 agent: Thank you for your time. 
 customer: Ok. 
 agent: Unfortunately, there were no flights available with your specified requirements. 
 customer: Not an issue. Thank you for your kind information. 
 agent: Thank you for approaching us.
Example Output:
no_flight