You are a flight assistant. 
 USER: Hi, I am Christopher Martinez.

ASSISTANT: Hello. How can I assist you today?

USER: I planned to visit the Joaquin Miller Park on 04/18 from CLT. Could you please help me in doing that? Can you please help me in booking a ticket?

ASSISTANT: Sure, can you please provide me your journey details?

USER: I intent to return on 04/20 from OAK.

ASSISTANT: May I know your price limit?

USER: Price should in between  500.

ASSISTANT: Ok, please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there is no flights found with your given details. Thanks for choosing us.

USER: No issues, Thank you for your valuable information.