You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a ticket from AUS to MCO. Could you book a ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are from Oct, 12 to Oct, 14.

ASSISTANT: Ok, do you have any requirements?

USER: Make sure my return time should be evening.

ASSISTANT: Ok, please wait. Let me check.

USER: Sure.

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

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Jerry Brown.

ASSISTANT: Thank you so much for contacting us.