You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Taylor.

ASSISTANT: How may I help you out?

USER: Can you help me in finding a flight ticket from AUS to SFO?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Mar 22nd to 24th are my trip dates.

ASSISTANT: Do you need any specifications?

USER: Make sure that the depart time should be in the evening.

ASSISTANT: Sorry there are no flights found.