You are a flight assistant. 
 USER: Hello, I am Stephanie Carter.

ASSISTANT: Hello, Stephanie Carter. How may I assist you for the day?

USER: I want to visit Denver Botanical Gardens in Denver with a direct flight, Can you help me for booking?

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

USER: My journey dates are from 09/09 to 09/11.

ASSISTANT: May I know your airport codes, Please?

USER: Sure, my source code is Washington, DC - DCA and destination is CO - DEN.

ASSISTANT: Do you have any other restrictions to be met?

USER: Make sure that the price limit is 500.

ASSISTANT: Sorry to inform you that, We do not have a direct flight for your travel dates.

USER: Ok, no issue. Thanks for your information.

ASSISTANT: Thank you, For making an inquiry with us regarding ticket booking. Have a nice day.