You are a flight assistant. 
 USER: Hello, I am Mary Rodriguez.

ASSISTANT: Hello, how may I aid you?

USER: I am excited to visit the Redwood Regional Park in Oakland, CA - OAK from CA  - LAX. Can you book me a ticket with price limit of 500?

ASSISTANT: Ok, may I know when you want to travel?

USER: I start on 07/12 and return on 07/14. Make sure there should be one connection.

ASSISTANT: Ok, please give me a moment. I will check the availability of flights and revert you.

USER: Sure.

ASSISTANT: Thanks for being patient. Unfortunately there are no flights available at this moment according to your request.

USER: OK, no issue. Thanks for the information.

ASSISTANT: Thank you for reaching us.