You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Jacob Johnson. Can you please book a flight ticket from AUS to IAD?

ASSISTANT: Sure, I am happy to aid you in flight ticket booking process. Can you please let me know your preferable travel dates for booking flight ticket?

USER: Sure, I need to travel on dates of 06/16 and 06/18.

ASSISTANT: Wait for a moment, please.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flight is available for you as per your requests.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.