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

customer: Hello,. 
 agent: Hello. 
 customer: I am Larry Turner. 
 agent: How may I address you today? 
 customer: As, there is a food festival is going to be held in Charlotte, CLT so, I want to my food stall in that festival. So, I need your assistance in booking my flight ticket from Boston, BOS. 
 agent: Sure, is there any connection preference? 
 customer: I am comfortable to travel in any flight. 
 agent: Can I know your preferable travelling dates? 
 customer: My schedule dates are 03/24 - 03/26. 
 agent: Please wait a moment I will check and revert to you. 
 customer: Sure. 
 agent: We found a Delta airline matching your details with the connecting flight and the price 200. 
 customer: You can proceed with my booking. 
 agent: Your booking has been confirmed. 
 customer: Thank you for kind service. 
 agent: Thanks for choosing us.
book

customer: HI. 
 agent: Hello. What help that I can assist you? 
 customer: I want to change an existing  reservation due to sudden change in my trip. Can you help me? 
 agent: Sure, I can help you and can you please mention your name for checking purpose? 
 customer: Paul Collins. 
 agent: Please wait for a moment. 
 customer: Ok. 
 agent: Thank you for waiting, I have checked in reservation list to change your ticket but could not find any reservation with your name. 
 customer: No issue. Thank you. 
 agent: Thank you for reaching us, have a nice day.
no_reservation

customer: Hello. 
 agent: Hello. 
 customer: I am Karen Walker. 
 agent: How can I assist you? 
 customer: I want to book a ticket from PHL to JFK to attend seminar, can you help me in booking? 
 agent: Sure, please provide me your journey dates. 
 customer: I am departing on 03/17 and return on 03/19. 
 agent: Please wait for a minute. 
 customer: Sure. 
 agent: I found a flight in Southwest airlines with price 200. Shall I book the ticket for you? 
 customer: Please proceed for booking. 
 agent: Your ticket is confirmed and the flight number is 1018. 
 customer: Thank you. 
 agent: Thank you for contacting us.
book