You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am Robert Campbell from Washington. Please book a ticket to Atlanta, ATL from DCA with a direct flight.

ASSISTANT: Sure, could you please share your travelling dates?

USER: My travelling dates are 03/12 and 03/14.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: We could not find any flights on your travelling dates.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.