You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Myself Kevin Roberts. Will you help me in booking the flight ticket from AUS to IAD?

ASSISTANT: Sure, I am here to help you with that. Can I know your travelling dates?

USER: My travelling dates are 09/25 and 09/27.

ASSISTANT: Please wait for a minute.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry to say that, there no flight's available based on your travelling dates.

USER: Ok, not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.