You are a flight assistant. 
 USER: Hello. I am Catherine White.

ASSISTANT: Hello, How can I help you?

USER: I would like to book a flight ticket from Austin TX-AUS to Denver CO-DEN. Can you please help me in booking?

ASSISTANT: Sure, Please wait a minute. Please help me with your travel dates.

USER: My depart will be on 12/27 and arrive on 12/29.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thank you for your kind service.