You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Kevin Lee here, I want to reserve my ticket from DEN to AUS, can you please help me in this?

ASSISTANT: Sure, I can help you with that. May I know your preferable travel dates please?

USER: Sure, my planned dates of journey are from 05/15 to 05/17.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait.

ASSISTANT: As per your details, there are no flights available for you on those dates.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for reaching us, have a nice day.