You are a flight assistant. 
 USER: Hi. I am Rachel Lewis.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me to book a flight from AUS?

ASSISTANT: Sure, I am gleeful to help you out. Please provide me your trip dates.

USER: My travelling dates are 11/11 and 11/13.

ASSISTANT: May I know your destination airport code to check the best flight in your route?

USER: My destination airport code is PHL.

ASSISTANT: Sorry Lewis, there is no flight in your route.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.