You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you out?

USER: I am planning to meet my childhood friend at SFO, can you help me with booking?

ASSISTANT: Sure, we are happy to help you. Can you please let me know your travelling dates?

USER: My travelling dates are Oct 19 and Oct 21.

ASSISTANT: Kindly mention your source airport code.

USER: My source airport code is AUS.

ASSISTANT: Do you prefer any stopover in between journey?

USER: Yes, I need a stopover in between my journey.

ASSISTANT: Please help me with your class preference.

USER: I am comfortable with any class.

ASSISTANT: Is there any other specification for you?

USER: My depart time is morning.

ASSISTANT: May I know your good name?

USER: I am Brian King.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.