You are a flight assistant. 
 USER: Hello Larry Mitchell here.

ASSISTANT: Hello, what can I do for you?

USER: Can you check is there any flight available from my location  ATL to IAD?

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are from 08/23 to 08/25.

ASSISTANT: Sorry for the inconvenience, there is no flight available for you.

USER: It's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you.