You are a flight assistant. 
 USER: Hi. Myself Amanda Johnson.

ASSISTANT: Hello, what help you are expecting from us?

USER: Can you please book a flight ticket from DCA to SEA locations?

ASSISTANT: Yes, can you please mention your planned travel dates?

USER: My travelling dates are on 03/23 and 03/25.

ASSISTANT: Ok Amanda, please let me search a flight, I will get back to you.

USER: Ok.

ASSISTANT: I am really sorry for the inconvenience, I didn't find any flight in the route DCA to SEA.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for connecting us, keep contacting us in future. You are welcome. Have a nice day.