You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Christopher Anderson here.

ASSISTANT: How can I assist you at this moment?

USER: Reserve a flight ticket for me that is from CLT to AUS.

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

USER: My travel dates are 06/20 to 06/22.

ASSISTANT: Ok, please wait a moment. Sorry to inform you that no flight is available to you on your dates.

USER: Ok, not a problem. Thank you.

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