You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Christopher Taylor, planning to visit Seattle. Can you please book me a ticket from ATL to SEA?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable journey dates are from 02/18 to 02/20.

ASSISTANT: Sorry, no flights available at this moment.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.