You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ryan Thomas.

ASSISTANT: How can I help you today?

USER: I am planning to visit AUS to meet my friend, can you please find a flight from IAD?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My travelling dates are 12/10 and 12/12.

ASSISTANT: Please allow me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, I will chose any other way to reach my destination.  Anyway thank you for checking.

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

USER: Welcome.