You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Help me in booking a flight from AUS to LAS?

ASSISTANT: Could you let me know your travelling dates?

USER: My travelling dates are Apr 13 to 15.

ASSISTANT: Is there any preference?

USER: I prefer travelling in single connection flight and I want to return back on morning.

ASSISTANT: May I know your name?

USER: I am Shirley Rodriguez.

ASSISTANT: I regret, currently there is no flight for your requirement.

USER: That's ok, thank you.

ASSISTANT: Thank you. Have a nice day!.