You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Stephanie Robinson.

ASSISTANT: How can I assist you today?

USER: I would like to visit Zilker park at Austin, as my doctor prescribed me to go for a change, will you help me with booking a flight ticket?

ASSISTANT: Sure, I can help you with that. Could you please provide the airport codes?

USER: My source and destination airport codes are LAS and AUS.

ASSISTANT: Can you please help me with your travelling dates?

USER: I would like to travel on 04/25 and return on 04/27.

ASSISTANT: Please allow me a moment to check for the availability of flight.

USER: Ok.

ASSISTANT: Your patience is greatly appreciated. Stephanie, I am sorry to inform you that there is no flight available at your request.

USER: Ok, not an issue, I will go by road. Thank you.

ASSISTANT: You are welcome.