You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your trip dates please?

USER: Ok, my preferable dates of journey are from 08/17 to 08/19.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Sorry Deborah, there is no flight available as per your request.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: My pleasure.