You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I assist you?

USER: I want to visit Zilker Park and Lady Bird Lake in Austin with my friends. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Can you please provide your name?

USER: Sure, my name is Dennis Campbell.

ASSISTANT: Can you provide your source of journey?

USER: The source of journey is from TX-HOU on 01/01.

ASSISTANT: Ok, do you want to have a return ticket?

USER: Yes, the return date 01/03.

ASSISTANT: Please, mention your source of journey.

USER: The destination code is TX-AUS.

ASSISTANT: Sorry for the inconvenience, there is no flight to your destination.

USER: No problem, I will search another flight to complete my trip. Thank you for your information.

ASSISTANT: Ok, fine hope you have a great day ahead.