You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Catherine Young. I am planning to visit Museum of Nature and Science at Denver, could you please help me with booking a flight ticket from AUS to DEN?

ASSISTANT: Sure, can you please share your travel dates?

USER: I would like to take off on 04/28 and return on 04/30.

ASSISTANT: Let me check for the availability of flight.

USER: I need a flight with connection 1.

ASSISTANT: I am sorry to inform you that there is no flight available at your request.

USER: That's ok, no issues.

ASSISTANT: Thank you for contacting us.

USER: Anyways, thank you for the information.

ASSISTANT: You are welcome.