You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I support you?

USER: I am Dennis Lee, I want to exhibit my arts in an exhibition at Los Angeles, CA - LAX. Help me with booking the flight ticket.

ASSISTANT: Sure, I can help you with booking. Can you please share your journey dates? Please provide your price limit?

USER: My travelling dates are from 05/04 and returning on 05/06. Price limit should not exceed 5000.

ASSISTANT: Could you please share your source?

USER: Origin point is from PA - PHL.

ASSISTANT: Please wait a while. I will check and let you know.

USER: Ok.

ASSISTANT: Thanks for your precious time. There are no flights found with your request.

USER: Ok, no issues.

ASSISTANT: It's my pleasure to help you. Have a nice day.

USER: Thanks for helping me.