You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Phillips.

ASSISTANT: Kevin, how can I assist you?

USER: I am planning to visit Atlanta to meet my friend, can you please book me a ticket from DEN to ATL?

ASSISTANT: Sure, please provide me your trip dates.

USER: My preferable journey dates are from 08/18 to 08/20.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no flight available on your preferred dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: You are most welcome.