You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Shirley Moore.

ASSISTANT: How may I help you out?

USER: Can you please book a flight ticket from SFO to AUS?

ASSISTANT: Sure, I will help you out. May I know your travelling dates please?

USER: Sure, I need to travel on dates of 06/16 and 06/18.

ASSISTANT: Sorry, there are no flights.

USER: It's ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your time.