You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Raymond Lewis here.

ASSISTANT: How can I assist you at this moment?

USER: I need to attend a workshop at Chicago, can you please help me in booking a flight ticket from ORD to AUS?

ASSISTANT: Sure Raymond, I will help you with that. Can I have your travel dates please?

USER: Sure, my planned trip dates are from 06/28 to 06/30.

ASSISTANT: Ok Raymond Lewis, please wait a moment to check flight availability.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Raymond Lewis, no flight is available to you on your dates.

USER: That's ok, no problem. I will check out with another agency. Anyway thank you for the information.

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