You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I am Shirley , I want to book a flight ticket from Philadelphia, PA- PHL to  Austin,TX- AUS.

ASSISTANT: Ok, can you please share your journey dates?

USER: My preferred journey dates are from 03/16 to 03/18.

ASSISTANT: Thank you for providing your details, no flight found matching your details.

USER: No, issues. Thank you for your service.

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