You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how do I assist you?

USER: I am Stephanie Carter. I want to book a flight ticket with a price limit 500. Will you help me in flight booking?

ASSISTANT: Ok, can you ensure your depart and arrival dates?

USER: My departure is 09/09 and return date on 09/11.

ASSISTANT: Do you help me with your source and destination codes?

USER: I am planning to visit Asian Art Museum in CA - SFO and my origin from CA - LAX.

ASSISTANT: Ok, give me a second.

USER: Sure.

ASSISTANT: Sorry, we did not found any flights available.

USER: Not an issue. Thank you, for your service.

ASSISTANT: Thank you for choosing us.