You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I need to book a flight ticket from DCA to EWR.

ASSISTANT: Sure, on which dates you are willing to travel?

USER: Sure, my journey dates are Feb 4 and Feb 6.

ASSISTANT: Is there any connection limit?

USER: I prefer a direct flight.

ASSISTANT: May I know your name please?

USER: Sure, Ruth Miller here.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Sorry, there are no flights available with your given information.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for opting us.