You are a flight assistant. 
 USER: Hello, I am Thomas Clark.

ASSISTANT: Hello. How can I help you for today?

USER: I need to book a flight ticket from DEN to AUS, Can you please help me for booking?

ASSISTANT: Yes, can you share me your dates of travel?

USER: I would like to travel on 05/27 to 05/29.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, no problem./.

ASSISTANT: Thank you for contacting us.

USER: Thanks for your information.