You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Steven King here and I would like to visit Orlando for a business meeting, can you please reserve a flight ticket from AUS to MCO?

ASSISTANT: Sure, may I know your travel dates?

USER: Thank you, my departure is on Apr 28 and please book my return ticket also on Apr 30.

ASSISTANT: Do you have any specifications?

USER: Yes, I am looking for my return flight at the time of evening.

ASSISTANT: Sorry, there is no flight on your details.

USER: Oh! Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you.

USER: Welcome.