You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Larry Rodriguez, want to travel from SFO to AUS. Please help me.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from 04/22 to 04/24.

ASSISTANT: Sorry, there is no flight available as per your request.

USER: That's fine, thank you for your time.

ASSISTANT: Welcome.