You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I want to book a direct flight to have a round trip in Chicago city in the month of December.

ASSISTANT: Sure, I am happy to help you. Can you please let me know the dates of your trip that you are planning?

USER: My planning dates are 12/24 and 12/26.

ASSISTANT: Can you please provide your airport regional codes?

USER: I want to have a round trip in Chicago so my source and destination code will be same ORD.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Ok, there are no flights that are obtained with direct flights.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Most welcome. May I know your name for booking purpose?

USER: Sure, I am Robert Hernandez.

ASSISTANT: Ok, thank you.

USER: Thank you for the help.