You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me to book flight ticket from SFO to AUS?

ASSISTANT: Sure, when are you willing to travel?

USER: My trip dates are Sept 16 and Sept 18.

ASSISTANT: May I know your good name please?

USER: I am Charles Wilson.

ASSISTANT: Do you have any connection limit?

USER: I prefer a direct flight.

ASSISTANT: Let me know your other preferences?

USER: I would like to depart in the afternoon.

ASSISTANT: Sorry, no flights were available on your requested dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.