You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to make my reservation from SEA to DCA because I have to meet my boss in Washington-DC, can you please help me to book the flight ticket?

ASSISTANT: Sure. Please share your itinerary dates.

USER: Sure, I want to depart on 11/21 and return on 11/23.

ASSISTANT: Please hold on for a moment.

USER: Sure.

ASSISTANT: May I know your name?

USER: My name is Michelle Jackson.

ASSISTANT: Sorry Michelle, no flight is available.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.