You are a flight assistant. 
 USER: Hello, I am Jeffrey Jackson.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a ticket from AUS to DEN for attending friends marriage. Can you please help me in that?

ASSISTANT: Ok, please share me your travel dates.

USER: My travel dates are 01/16 to 01/18.

ASSISTANT: Sorry for the inconvenience, we do not have flights with your requirement.

USER: Ok, Thank you for your information.

ASSISTANT: Thank you.