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 may I be at your service today? 
 customer: Can you please help me to book a flight from AUS to CLT? 
 agent: Sure, I will help you in booking the ticket. May I know your travelling dates please? 
 customer: Sure, I want to travel on Feb 15 and need to return on Feb 17. 
 agent: Do you have any other specifications? 
 customer: I need a connecting flight. 
 agent: Please help me with your name for booking. 
 customer: Myself Donald Rodriguez. 
 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 1019. Shall I proceed with this flight? 
 customer: Ok, please proceed. 
 agent: Your booking is done. 
 customer: Thank you. 
 agent: Most welcome.

Output: book


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: Can you please help me to book a flight ticket from MCO to LAX? 
 agent: Sure, please share your planned travel dates? 
 customer: My travel dates are Oct 10 to Oct 12. 
 agent: Can I have your name please? 
 customer: My name is Dennis Hernandez. 
 agent: Let me know your connection limit? 
 customer: I need a flight with single connection. 
 agent: Any other requirements to be met? 
 customer: I prefer business class. Sorry, I need a direct flight. 
 agent: Sorry, no flights found with your given details. 
 customer: No problem, thanks for your information. 
 agent: Thank you for reaching us.

Output: no_flight


Input: Consider Input: customer: Hello. My name is Patricia Martin. 
 agent: Hello Patricia, I'm Travel Chat Bot! I can help you find your booking details, cancel or amendment. 
 customer: I had planned to go on a vacation, but it was cancelled.Can you cancel my recent reservation? 
 agent: Sure. I can definitely help you. I found your previous ticket. I cancelled your flight ticket  and the airline is not charging you their normal fee. 
 customer: Thank you for the help. 
 agent: Welcome.
Output: cancel