You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I want to do shopping for my friend's marriage in Ferry building marketplace where different malls are available, So I want to visit San Francisco, SFO. Can you help me to book a connecting flight?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travel dates are Aug 09 and 11.

ASSISTANT: Could you please share me your source airport code?

USER: My source is from Austin, AUS.

ASSISTANT: Ok, is there any class preference?

USER: I prefer business class.

ASSISTANT: Do you need any other specifications?

USER: I want to depart in the evening time.

ASSISTANT: May I know your name please to proceed further?

USER: Sure, Lisa Williams here.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, not an issue. Thanks for the help.

ASSISTANT: Thanks for opting us.