You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I planning a event in SEA, can you book me a flight from DCA?

ASSISTANT: Sure, I can help you with that. Can you please share your travelling dates?

USER: My planning dates are from 02/04 till 02/06.

ASSISTANT: May I know your name to proceed further?

USER: Myself Gary Rodriguez.

ASSISTANT: Thank you for providing.

USER: It's my pleasure.

ASSISTANT: Gary, I am sorry to inform you that there is no flight available at your requested dates.

USER: That's ok. Thank you for helping me.

ASSISTANT: You are welcome. Thank you for contacting us.