You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Patrick Martin. Will you help me in booking the flight ticket fom AUS to SFO?

ASSISTANT: Sure, can you please tell me your travel dates?

USER: My travelling dates are Sept 20 and Sept 22. I need a flight with single connection.

ASSISTANT: Sorry to inform you, there is no flight available on your preferred travel dates.

USER: Ok, not an issue. Thank you for you information.

ASSISTANT: You are welcome and thank you for choosing us.