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 Dennis Anderson. 
 agent: Hello, how may I aid you today from my end? 
 customer: I want to change my reservation, due to some health issue. Can you please help me out? 
 agent: Sure, I am here to help you out. Please allow me a moment. 
 customer: Ok, I will wait for your information. 
 agent: Sorry Dennis Anderson, there is no reservation on your name in our database. 
 customer: That's ok, thank you for checking. 
 agent: Thank you for reaching us.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello. 
 customer: David Evans here. 
 agent: How can I help you at this moment? 
 customer: I would like to visit New York for a business conference, can you please help me out with booking of a flight ticket to go there? 
 agent: Sure, I will help you in booking flight ticket. 
 customer: Thank you. 
 agent: Can you please mention your travel dates for booking flight ticket? 
 customer: Sure, I am planning to go on 10/03 and please book my return ticket on 10/05. 
 agent: May I know your preferable airport code names for further process? 
 customer: Sure, my nearest genesis airport code is SEA and my destination airport code is LGA. 
 agent: Please hold on a moment, I will check flight availability in this route. 
 customer: Ok, take your time but try to bring a best flight in my route. 
 agent: Based on your information, Southwest airline is ready to serve you with 1 connection with a minimum fare of 100 is available for you. Shall I proceed with this? 
 customer: That's fine, you can proceed with booking. 
 agent: Your flight ticket is booked successfully, flight number is 1021. 
 customer: Thank you for your assistance in booking of my ticket. Have a nice day. 
 agent: You are welcome.
Example Output: book

Example Input: customer: Hi, I am Kimberly Nelson. 
 agent: Hello, how can I render you today? 
 customer: I have to attend a Autoshow exhibition with my granddad. 
 agent: Ok. 
 customer: Can you make a reservation with a single connection? 
 agent: Sure, we are perky to help you. Can you please provide your take off and landing airport codes? 
 customer: Sure, I need to depart from LAS to IAD. 
 agent: On which dates would you like me to book a flight ticket for you? 
 customer: Sure, my journey dates are 01/10 and 01/12. 
 agent: May I know how much do you want to spend on flight ticket? 
 customer: I can bare upto 5000. 
 agent: Ok, please wait a moment, let me search a flight for you. 
 customer: Sure. 
 agent: Thanks for your precious time. We found Delta airline fare of 100. Shall I proceed for booking with single stopover flight? 
 customer: Go ahead. 
 agent: Your ticket has been confirmed with airline number 1002. 
 customer: Thank you for your help. 
 agent: Thank you for opting us.
Example Output:
book