You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Robert Perez here.

ASSISTANT: Welcome to ABC flight ticket booking agency. How can I help you Robert?

USER: There is a function at LGA, can you please book me a ticket from AUS?

ASSISTANT: Certainly, On which dates you want to departure and return?

USER: My travelling dates are from 04/14 to 04/16.

ASSISTANT: Ok, please wait a moment, I will inform is there any flight ticket available or not.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, no flights available as per your requested dates.

USER: That's ok. Thank you for your help.

ASSISTANT: Do you want to know any thing else from us?

USER: No, thank you.

ASSISTANT: Thank you for contacting us.