You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am planning to visit Atlanta city, can you please book me a ticket from SEA to ATL?

ASSISTANT: I will help you with that, can you please tell me your journey dates?

USER: My preferable journey dates are from 12/06 to 12/08.

ASSISTANT: May I know your name please?

USER: My name is Karen Parker.

ASSISTANT: I am sorry to say that there is no flight found.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you for reaching us.