You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Morning.

USER: Very good evening. I'm Michelle Phillips.

ASSISTANT: What kind of service that you are looking for?

USER: I am planning to visit National Art museum at LAX, Los Angeles. Can you please help me with booking a flight ticket from AUS?

ASSISTANT: Yes, I am here to help you. May I know on which dates you are planning to travel?

USER: Sure, I would like to take off on 05/26 and return back from Los Angeles on 05/28.

ASSISTANT: Ok Michelle, please give me a second so that I can search for the availability of flights for you.

USER: Ok, but please make sure that the price limit does not exceed 500.

ASSISTANT: Sorry for the inconvenience, there are no flights found which fulfil your requirements.

USER: Ok, no issues. I will try another alternate way to complete my trip. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.