You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am planning for a trip from SFO to AUS, can you help me over that?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: Ok, my trip dates are from May 25 to 27.

ASSISTANT: Ok, please let me know the timings of your journey.

USER: No, I need a flight in normal-cost with single connection.

ASSISTANT: Do you  prefer any specific class to travel?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Can I have your good name please?

USER: Patrick Lewis here.

ASSISTANT: Sorry to inform you that no flight is available to you on your dates in normal cost airlines.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us, have a good day.