You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Edward Young.

ASSISTANT: Hello Edward.

USER: I am planning to book a flight ticket to attend my sister's marriage in SEA, can you please book a flight ticket from DCA?

ASSISTANT: Sure, may I know your preferable dates of travelling?

USER: From 09/10 to 09/12. I need direct flight.

ASSISTANT: Sorry Edward, there are no direct flights available for your request.

USER: It's ok. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.