You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Emma Young here. Please help me out in booking the ticket from SEA to ATL.

ASSISTANT: May I know your desired travel dates please?

USER: My trip dates will be Mar 10 to Mar 12.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.