You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you today?

USER: I am James Mitchell. I would like to attend International Cherry Blossom Festival in Houston, IAH. Can you please book a direct flight for me?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My journey dates on 02/19 to 02/21. Price limit should not cross 500.

ASSISTANT: To proceed booking I need your other airport code.

USER: My source point is Chicago, ORD.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flight found on your given requirements.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for opting us.