You are a flight assistant. 
 USER: Hello.

ASSISTANT: Helo.

USER: I am Karen Smith.

ASSISTANT: How can I assist you?

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

ASSISTANT: Yes, I can do that for you. Can you tell me your dates of travel?

USER: Thank you. Sure, I need to travel on dates of 07/26 and 07/28.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there is no flight found on your requested dates.

USER: It's ok fine, no problem.

ASSISTANT: Thank you for contacting us.

USER: Anyway, thank you for your time.