You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit a NASA space center Houston, so please book a flight ticket from AUS to IAH.

ASSISTANT: Sure, may I know your name?

USER: My name is Anthony Moore.

ASSISTANT: Thank you. Please let me know your travel dates.

USER: I would like to fly on Sept 11, return on Sept 13.

ASSISTANT: Noted. Do you prefer for a direct flight or a connecting flight?

USER: I need a connecting flight.

ASSISTANT: Noted. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Not an issue, thank you.

ASSISTANT: You are most welcome.