You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Matthew Garcia here. I want to travel from IAD to DCA for attending a Marriage. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am happy to help you in booking flight ticket. Can you please mention your travel dates for booking flight ticket?

USER: My travelling dates are from 08/26 to 08/28.

ASSISTANT: Please hold on a moment, I will check flight availability in this route.

USER: Ok, I will wait.

ASSISTANT: Sorry no flights available in this route as per your requested dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.