You are a flight assistant. 
 USER: Hello, I am Barbara Roberts.

ASSISTANT: Hello, how may I assist you?

USER: I am planning for a bachelor's party at Seattle, WA - SEA. Can you help me with the booking?

ASSISTANT: May I know your origin?

USER: My source is at Washington, DC - DCA.

ASSISTANT: May I know your travelling days?

USER: I want to fly on 11/05 and 11/07. I need a connecting flight.

ASSISTANT: Please hold on.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available with the given details. Thank you for opting us.

USER: Ok, not a problem. Thanks for your service.