You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kathleen Mitchell here.

ASSISTANT: Mitchell, how can I assist you today?

USER: Please book a ticket from AUS to IAH.

ASSISTANT: Sure, can you please tell me your travel dates?

USER: My travelling dates are from 04/26 and 04/28.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights available on your given dates.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us and have a nice day.