You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am Stephanie Green here, I want to reserve my ticket from PHL to AUS, can you please help me?

ASSISTANT: Sure, I am here to help you. Can you please provide me your travel dates?

USER: Sure, my planned dates of journey are from 12/28 to 12/30.

ASSISTANT: Ok, please be online for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight available on your preferred dates.

USER: Ok, that's fine. Anyways, thank you for your service.

ASSISTANT: You are welcome and thank you for approaching us.