You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I want to go Atlanta, to attend my grandson school Annual Day Celebrations. Could you please book my flight ticket?

ASSISTANT: Sure, may I know your journey details?

USER: I wish to start form Oakland, airport codes are OAK - ATL, journey dates on 10/30 to 11/01.

ASSISTANT: Sorry, unfortunately there is no flight with your requested dates.

USER: Thank you for your information.

ASSISTANT: For documentation purpose, may I know your name please?

USER: My Name is Jeffrey Thomas.

ASSISTANT: Thank you for reaching us, have a nice day.