You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Anthony Hill. I would like to book a flight ticket to meet my friend in Charlotte. Can you help me for booking a flight ticket from AUS to CLT?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are Dec 20 and Dec 22.

ASSISTANT: At what time do you like to travel?

USER: My return time is morning.

ASSISTANT: Do you prefer economy or business class?

USER: I prefer business class.

ASSISTANT: Do you have any specification?

USER: I need a direct flight in my journey.

ASSISTANT: I am sorry to say that there is no flight on your details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.