You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicole Martin.

ASSISTANT: How can I help you for the day?

USER: Can you aid me in booking an economy class ticket from ATL to PHX?

ASSISTANT: Sure, I am mirthful to help you with that. May I know your travelling dates, please?

USER: Please send your travelling dates too. I am planning to start on 12/20 and return back on 12/22.

ASSISTANT: Please wait for a a moment.

USER: Take your time.

ASSISTANT: Thank you for waiting, but I am sorry to tell you that, there are no flights available as per your travel dates.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for choosing our agency, have a nice day.

USER: You are welcome.