You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from Denver, DEN to attend Cultural festival.

ASSISTANT: May I know your airline preference?

USER: I prefer normal-cost airline.

ASSISTANT: Do you have any requirements?

USER: Yes, I want single connected flight.

ASSISTANT: Can you help me with your travelling dates?

USER: My travelling dates are Apr 2 and Apr 4.

ASSISTANT: May I know your destination airport code?

USER: My landing airport code is AUS.

ASSISTANT: May I know your name?

USER: Sure, David Turner here.

ASSISTANT: Sorry, no flight is available for you.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for reaching us.