You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Rachel Lewis. Can you please book me a flight ticket from OAK to ATL?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: Sure, my trip dates are from 12/28 to 12/30.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you and have a nice day.