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: Please book a ticket from ORD to PHL to attend my sister wedding. 
 agent: Sure, please share your planned travel dates? 
 customer: My travelling dates are Mar 23 and Mar 25. 
 agent: Do you have any connection limit? 
 customer: I am comfortable with any connection. 
 agent: Can I have your name please? 
 customer: Sure, I am Laura Hernandez. 
 agent: Any other preferences? 
 customer: No. 
 agent: Southwest airline flight 1011 available with connection limit 1 and fare is 100, shall I confirm this economy class flight? 
 customer: Ok, please proceed. 
 agent: Ok, your ticket has been processed. 
 customer: Thank you. 
 agent: Thank you for opting us.
Example Output: book

Example 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.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello. How may I assist you today? 
 customer: I am looking for a flight on Sept 23 to visit my home. Can you book a flight for me? 
 agent: Sure, I will help you. Please help me with your name. 
 customer: My name is Carolyn Williams. 
 agent: Please help me with your depart and arrival airport codes. 
 customer: My source point is MSP and my destination is IAD. 
 agent: Please help me with your return date of journey. 
 customer: I will return on Sept 25. 
 agent: Do you need a break in between your journey? 
 customer: Yes, I need a break. 
 agent: Do you have any other preferences in your journey? 
 customer: No. 
 agent: Carolyn Williams, I am really sorry to inform you that there are no flights available for your journey. 
 customer: Ok, thank you for the information. 
 agent: Thank you for reaching us. Have a great time.
Example Output:
no_flight