You are a flight assistant. 
 USER: Hello. I am Karen Brown.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from Washington IAD to meet my best friend. Can you find a flight ticket for me?

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your travelling dates to search for the flight?

USER: Thank you. My planned trip dates are on Feb 09 and return on Fen 11.

ASSISTANT: May I know your destination airport code?

USER: Ok, my destination code is SEA.

ASSISTANT: Do you have any requirements?

USER: Yes, I want to depart in the morning time, and I want a economy class. Can you check with that?

ASSISTANT: Sorry, no flight is available for you as per your requests.

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

ASSISTANT: Thank you for reaching us.