You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Myself Eric Williams. I am planning to visit Las Vegas, can you help me in booking the flight ticket from DCA to LAS?

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

USER: Sure, my travel dates are 02/27 and 02/29.

ASSISTANT: Sorry to say, no flights found in your route.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.