You are a flight assistant. 
 USER: Hi, I am Edward Miller.

ASSISTANT: Hello, how can I assist you today?

USER: Could you please make a flight reservation on 08/03 and return on 08/05?

ASSISTANT: Sure, I can help you as per your request. May I know your source and destination point for booking flight ticket?

USER: My airport codes are IAD - AUS.

ASSISTANT: Sorry, no flights are available at present on that locations.

USER: Ok, thanks for your response.

ASSISTANT: Thanks for approaching us, have a nice day.