You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Debra Wilson here. I would like to visit OAK, can you help me to book a flight ticket from ATL?

ASSISTANT: Sure, I am glad to help you with that Debra. Could you please provide your planned dates of journey?

USER: My preferable dates are 09/14 to 09/16.

ASSISTANT: Please be on hold for a while to check for the available flights to your route Debra.

USER: Sure.

ASSISTANT: I regret to say this Debra, there are no flights due to over booking of the tickets to your route.

USER: It's ok, not a problem. I will choose another service.

ASSISTANT: Ok, sorry for the inconvenience Debra.