You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Benjamin Robinson here. Please help me out in booking the ticket from SFO to AUS.

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates will be Apr 26 to May 01.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flight is available for you as per your requests.

USER: That's ok, not a issue. Thank you for informing.

ASSISTANT: Thank you for reaching us, have a nice day.