You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Gregory Jackson. I am looking for a flight from DCA to LAS, can you help me out in booking the flight?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My trip dates are from Feb 27th till Feb 29th.

ASSISTANT: Do you have any airline preferences?

USER: No, I am looking for an economy class flight.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No.

ASSISTANT: Sorry, there are no flights available at your request.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.