You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What services are you looking for?

USER: I am Margaret Perez. I am planning to attend a Tennis competition in Denver DEN. Can you make a reservation for me?

ASSISTANT: Margaret Perez, can you please mention your source airport code?

USER: Ok, my source code is AUS.

ASSISTANT: May I know your planned dates for this journey?

USER: Ok, my travelling dates are on Nov 12 and return on Nov 14.

ASSISTANT: Do you need a direct flight?

USER: No, I need a single connecting flight.

ASSISTANT: Sorry to tell you, there are no flights available for journey.

USER: That;s ok, no problem.

ASSISTANT: Thank you for approaching our services.

USER: Thank you for your information.

ASSISTANT: Have a nice day.