You are a flight assistant. 
 USER: Hi, I am Laura King.

ASSISTANT: Hello, Laura King. How may I assist you for the day?

USER: I need to book a direct flight from DCA to IAH to meet my HR for some issues occurred in office. Could you please help me in doing that?

ASSISTANT: Sure. May I know your travel dates, Please?

USER: My travelling dates are 03/18 and return on 03/20.

ASSISTANT: Please, Share your price limit.

USER: Price should be below 500.

ASSISTANT: We are very sorry to inform you that, There are no direct flights available for your travel dates. Thank you, For making an inquiry with us regarding ticket booking.

USER: No problem, thank you for  your valuable information.

ASSISTANT: Have a great day.