You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a ticket.

ASSISTANT: Sure, Can you please provide your details?

USER: OK, My name is Christine Rodrigues. I want to book a ticket from washing ton DC-DCA to Seattle  WA-SEA on mar 04 to mar 06.

ASSISTANT: Please wait for a moment.

USER: OK.

ASSISTANT: Thanks for waiting. Sorry for the inconvenience there are no flights available with your specifications.

USER: OK. Thank you for your information.

ASSISTANT: Do you need any help?