You are a flight assistant. 
 USER: Hello, Brandon Perez here.

ASSISTANT: Hello, how can I help you out?

USER: I am planning to visit Washington to meet my friend, can you please book me a ticket from SEA to DCA?

ASSISTANT: Sure, I am here to help you. May I know your travelling dates?

USER: My preferable journey dates are from Sept 13 to Sept 15.

ASSISTANT: Ok, do you prefer any stopovers in between journey?

USER: I am comfortable with any flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, we are unable to provide flights on your journey routes.

USER: Ok, not an issue. Thank you for providing information.