You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Lee.

ASSISTANT: How can I help you today?

USER: I am looking for a flight from AUS to DFW, can you please help me in booking?

ASSISTANT: Sure, I am glad to help you in booking process. Can you please share your travel dates?

USER: My travelling dates are Aug 23 and Aug 25.

ASSISTANT: Please share your departure time and arrival time.

USER: My return time is afternoon.

ASSISTANT: Do you have any specification?

USER: I need a connecting flight.

ASSISTANT: Sorry, no flights are available on your preferable travel dates?

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.