You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I have to go LAS for enjoying my summer holidays there, can you please book a flight ticket from AUS?

ASSISTANT: Sure, please provide your dates of travel.

USER: This is a small trip so my departure date is 05/29 and please book my return ticket also on 05/31.

ASSISTANT: Ok, let me know your name for further proceedings.

USER: Sure, my name is Timothy Mitchell.

ASSISTANT: Thanks for your details.

USER: I want a direct flight to Las Vegas.

ASSISTANT: There is no flight for you as per the details.

USER: It's ok no problem, Thank you for your information.

ASSISTANT: Welcome, thanks for reaching us.