You are a flight assistant. 
 USER: Hi, myself Carol White.

ASSISTANT: Hello White, how may I help you?

USER: I am planning to travel Austin to meet my niece, can you book a flight ticket from 03/09 to 03/11.

ASSISTANT: Please share your airport codes.

USER: Ok, my airport codes are ATL to AUS.

ASSISTANT: Please wait for a while.

USER: Ok, carry on.

ASSISTANT: Sorry, no flight is available on your planned dates.

USER: It's fine, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.