You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Donna Walker here. Can you please help me in booking a flight ticket from AUS to IAH?

ASSISTANT: May I know your desired travel dates please?

USER: My trip dates are 11/12 - 11/14.

ASSISTANT: Do you have any other specifications?

USER: I need a single connection.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No problem , thank you.

ASSISTANT: Thank you for opting us.