You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: Can you help me to book a direct flight?

ASSISTANT: Sure, we are glad to help you. Please let me know airport codes.

USER: My airport codes are JFK and DCA.

ASSISTANT: Kindly mention your travelling dates.

USER: My travel dates are May 02 and May 04.

ASSISTANT: Is there any other specifications for you?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Timothy Nelson.

ASSISTANT: We are regret to inform you that, no flights are available on your requirements.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.