You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Angela Taylor.

ASSISTANT: Taylor, how can I serve you now?

USER: I am planning to book a ticket from ATL to AOK. Ca you please help me out?

ASSISTANT: May I know your preferred dates of trip?

USER: I would  like to travel on 06/19 and return back on 06/21.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Sorry, no flight is available.

USER: That's fine. Thank you for your help.

ASSISTANT: Welcome, have a nice day.