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 can I assist you today? 
 customer: Can you help me to book a flight ticket from ATL to MSP? 
 agent: Sure, I will help you with that, can you share me your travelling dates? 
 customer: My preferable journey dates are Nov 28 and Nov 30. 
 agent: Do you have any connection limit? 
 customer: Yes, my connection limit is 1. 
 agent: Can you have any airline preference? 
 customer: I would like to prefer normal cost airline. 
 agent: I would like to know your name for booking for a flight ticket? 
 customer: My name is Samantha Carter. 
 agent: United Airlines is available with the price of 200 having one connection and economy class. Can I proceed to booking? 
 customer: Please proceed. 
 agent: Your ticket is booked with the flight- 1008. 
 customer: Thank you. 
 agent: Thank you for reaching us.

Output: book


Input: Consider Input: customer: Hi. 
 agent: Hello. How can I assist you today? 
 customer: I booked a flight ticket in your agency for my holiday trip to Houston but now I want a change in the travel dates. So can you go ahead and change my flight ticket? 
 agent: Sure, may I know your name to check for the previous reservation? 
 customer: I am Timothy Mitchell. 
 agent: Please allow me a moment. 
 customer: Sure. 
 agent: Timothy Mitchell, there is no reservation found under your name. 
 customer: Ok, not a problem. Thanks for your information. 
 agent: Thank you for contacting us.

Output: no_reservation


Input: Consider Input: customer: Hello, I am Paul Gonzalez. 
 agent: Hello, in what way I can be at your service? 
 customer: I want to meet my old collage friends at Boston, can you please book me a ticket? 
 agent: Sure, can I have your airport codes? 
 customer: My airport codes are from IAH to BOS. 
 agent: Ok, when are you planning to travel? 
 customer: I would like to leave between 07/14 and 07/16. 
 agent: Do you have any other preferences? 
 customer: I need a connecting flight. 
 agent: Sorry to inform you Paul Gonzalez, no airline is providing service on your route. 
 customer: Ok, no problem. Thank you. 
 agent: Thank you for choosing our service.
Output: no_flight