You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Can you aid me in booking a flight ticket from IAD to ATL?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on June 04th and return back on June 06th.

ASSISTANT: Do you have any airline preference?

USER: Ensure it is in the normal-cost airline.

ASSISTANT: Do you have any connection preference?

USER: Ensure it is a single connecting flight.

ASSISTANT: May I know your name?

USER: Myself Patricia Lewis.

ASSISTANT: Sorry, there is no flight available on your requested dates with your given requirements.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, have a nice day.