You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Pamela Baker. I am planning to visit Downtown Aquarium at Houston, could you please help me with booking a flight ticket from AUS to IAH?

ASSISTANT: May I know your desired travel dates please?

USER: I would like to take off on 01/27 and return on 01/29.

ASSISTANT: Sorry to say, there is a flight on your desired travel dates.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Thank you for opting us.