You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Young.

ASSISTANT: How may I help you today?

USER: I am planning to visit Philadelphia from AUS to PHL. Can you make a reservation for me?

ASSISTANT: Sure, please mention your travelling dates.

USER: Sure, my planned trip dates are on 12/07 and return on 12/09.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry Young, there are no flight tickets available on your journey dates.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for reaching our service.