You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me with booking a flight ticket from IAD to CLT?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are from May 12-14.

ASSISTANT: Do you have any connecting flight preferences?

USER: I prefer to fly in direct flight.

ASSISTANT: Is there any other concern?

USER: No.

ASSISTANT: May I know your name please?

USER: Jerry Smith here.

ASSISTANT: No flights found as per your preferences at the moment.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.