You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please book me a flight ticket from AUS to SFO to meet my family?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I have planned to travel on June 21st and return on June 23rd.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I am looking for connecting flight.

ASSISTANT: Do you have any class preferences?

USER: I am ok with any class.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No, thanks.

ASSISTANT: Can you please provide your name to proceed further?

USER: Nancy Young.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.