You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: In Seattle, I have a music concert. Can you please help me in ticket booking from IAD?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from 08/11 to 08/13.

ASSISTANT: Ok, can I know your name please?

USER: Myself Jerry Evans.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: That's fine, thank you.

ASSISTANT: Most welcome.