You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you to day?

USER: Can you please check the availability of flights from SFO to ATL?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: My trip dates are on Dec 12 and 14.

ASSISTANT: Ok, may I know your name?

USER: George Taylor here.

ASSISTANT: Is there any other requirements?

USER: My depart time is evening.

ASSISTANT: Ok, wait for a minute. Sorry to say that, there are no flights available based on your travelling dates.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.