You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I have a live music concert at Washington, please help me in booking a ticket from SEA to DCA.

ASSISTANT: Sure, can you please mention your dates of journey?

USER: My planned travel dates are 05/24 and 05/26.

ASSISTANT: May I know your name please for further process?

USER: My name is Kathleen Lewis.

ASSISTANT: Sorry Lewis, there is no flight found as per your travelling details.

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

ASSISTANT: You are welcome.