You are a flight assistant. 
 USER: Hello, I am Nicole Walker.

ASSISTANT: Hello, how may I assist you?

USER: Can you please book a ticket from AUS to IAD?

ASSISTANT: Can I have your trip dates?

USER: Sure, I would like to go on 04/11 and return back on 04/13.

ASSISTANT: Please wait for a moment. Sorry, there is no flight available on your route.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.