You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brenda Wright.

ASSISTANT: How may I help you?

USER: I want to book a ticket from AUS to LAS to attend seminar, can you help me in booking?

ASSISTANT: May I know your travel dates?

USER: I am departing on 12/11 and return on 12/13.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.