You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Please help me to book a flight ticket from EWR to AUS.

ASSISTANT: Sure, may I know your good name?

USER: Alexander Hall.

ASSISTANT: When you are willing to travel?

USER: My journey dates are from Feb, 25 to Feb, 27.

ASSISTANT: May I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer a business class to fly.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Thank you for your information.

ASSISTANT: Thank you for approaching us.