You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I would like to travel from AUS to IAD, can you please book my flight ticket?

ASSISTANT: Sure, can you please mention your departure and arrival dates of your journey?

USER: Thank you. I will depart on Dec 3rd and return back on Dec 5th.

ASSISTANT: Do you need any layover in between  journey?

USER: I am looking for a connecting flight.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I prefer for a business class.

ASSISTANT:  May I know your name for the documentation process?

USER: My name is Richard Lewis.

ASSISTANT: Thank you for the information, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.