You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to book a ticket from IAD to AUS, can you help me?

ASSISTANT: May I know your travel dates please?

USER: My travel dates are 08/30 and 09/01.

ASSISTANT: May I know your name please?

USER: Myself Jessica Lewis.

ASSISTANT: There is no flight available on your desired travel dates.

USER: No problem, thanks for checking.

ASSISTANT: Welcome.