You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Deborah Lee, please book a ticket to Austin, AUS to attend conference from Charlotte, CLT.

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates are on 09/15 and 09/17.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, thanks for informing me.

ASSISTANT: Thank you for opting us.