You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Katherine Baker. I have to attend a Live Concert at San Francisco, could you please help me with booking a flight ticket from AUS to SFO?

ASSISTANT: Sure, may I know your travel dates please?

USER: I would like to depart on Feb 15th and return on Feb 17th.

ASSISTANT: Ok, please wait for a while.

USER: Make sure that my return time is afternoon.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.