You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel in the normal cost airline from AUS. Can you please help me in ticket booking?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from 05/18 to 05/20.

ASSISTANT: Can I know your destination airport code please?

USER: My destination airport code is IAH.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: Yes, I need a single connection in between my journey.

ASSISTANT: Can I know your name?

USER: Sure, myself Patricia Collins.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you for searching.

ASSISTANT: Most welcome.