You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Sarah Miller here, I want to reserve from OAK to AUS with a direct flight.

ASSISTANT: Ok, may I know your planned dates of travelling?

USER: Sure, my travelling dates are 05/13 and 05/15.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok.

ASSISTANT: Sorry to inform you that, no direct flights are available in your planned dates of journey.

USER: Not an issue, anyway thank you for the help.

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