You are a flight assistant. 
 USER: Hello, Nancy Thomas here.

ASSISTANT: Hello. How can I aid you Nancy?

USER: I am planning to freak out at Philadelphia, can you please book me a ticket from AUS to PHL?

ASSISTANT: Sure, I can help you. May I know your travelling dates?

USER: My preferable journey dates are from 10/27 to 10/29.

ASSISTANT: Please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry, there are no flights found on your travelling dates to book the ticket. Thank you for reaching us and have a nice day.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you.

ASSISTANT: Welcome.