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. 
 agent: Hello. How can I help you today? 
 customer: I am  Carol Williams. I want to book a fight ticket from PHX to ORD. Can you find a flight ticket for me? 
 agent: Sure, may I know your travel dates to search available flight for you? 
 customer: Sure, I am planning to travel on these days that is on 02/02 and back on 02/04. 
 agent: Wait for a minute, to check. 
 customer: Ok, make sure that the connection limit 1. 
 agent: Sorry, I could not find any flight with your connection. 
 customer: Ok, no problem. Thank you for your information. 
 agent: My pleasure.
Example Output: no_flight

Example Input: customer: Hi. 
 agent: Hello, how may I serve you today? 
 customer: Owing to an emergency I want to cancel my reservation, can you help me? 
 agent: Sure, can you please provide your name? 
 customer: I am Gregory Adams. 
 agent: Hold on a minute. 
 customer: Sure. 
 agent: We found your reservation and it has been cancelled successfully. 
 customer: Thank you for your help. 
 agent: Thank you for choosing us.
Example Output: cancel

Example Input: customer: Hello. 
 agent: Hello. 
 customer: I am Angela Taylor. 
 agent: Taylor, how can I serve you now? 
 customer: I am planning to book a ticket from ATL to AOK. Ca you please help me out? 
 agent: May I know your preferred dates of trip? 
 customer: I would  like to travel on 06/19 and return back on 06/21. 
 agent: Please wait. 
 customer: Ok. 
 agent: Sorry, no flight is available. 
 customer: That's fine. Thank you for your help. 
 agent: Welcome, have a nice day.
Example Output:
no_flight