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: Hello, I am Ryan Roberts. 
 agent: Hello, how can I assist you? 
 customer: I need to fly Austin for my brother's engagement, could you please help me in booking from JFK to AUS? 
 agent: Sure, when are you planning to travel? 
 customer: My journey is from 03/03 to 03/05. 
 agent: Please provide your specifications. 
 customer: I need a halt in mu journey. 
 agent: Unfortunately, there is no flights available based on your details. 
 customer: Ok, no worries. Thank you. 
 agent: Thank you.
Example Output: no_flight

Example Input: customer: Hello. 
 agent: Hello, how may I be at your service today? 
 customer: I would like to travel from MCO to DEN as a business trip, can you do the reservation? 
 agent: Sure, I will help you in booking the ticket. May I know your travelling dates please? 
 customer: My trip dates are 02/21 and 02/23. 
 agent: Do you have any other specifications? 
 customer: I need break in my journey. 
 agent: Please help me with your name for booking. 
 customer: Charles Wilson here. 
 agent: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 with flight number 1017. Shall I proceed with this flight? 
 customer: Go ahead. 
 agent: Your booking is done. 
 customer: Thank you so much. 
 agent: Most welcome.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello. How can I assist you today at this moment? 
 customer: Could you help me in booking a flight ticket from CLT to IAH? 
 agent: Sure, I will help you in booking a flight ticket. Kindly mention your departure date and arrival date? 
 customer: I will start on Oct 16, return on Oct 18. 
 agent: Let me know your connection limit. 
 customer: I would like to travel on connecting flight. 
 agent: If you have any other requirements, please let me know. 
 customer: I want economy class flight ticket. 
 agent: Just give me a moment. 
 customer: Sure. 
 agent: Thanks for waiting. .According to your given information we have found a flight with an airline Southwest of flight 1008 in an economy class with single connection. Would you like me to proceed further? 
 customer: Ok, proceed to booking. 
 agent: To proceed further may I know your good name please? 
 customer: My name is Timothy Martin. 
 agent: Your ticket has been booked on name of Timothy Martin. 
 customer: Thank you. 
 agent: Thank you.
Example Output:
book