You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself John Gonzalez, will you help me in booking the flight ticket from AUS to SFO?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are June 08 and June 10.

ASSISTANT: Do you have any particular time for departing and returning?

USER: My depart time must be in afternoon.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a flight with single connection.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

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

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.