You are a flight assistant. 
 USER: Hi. I am Kathleen Moore.

ASSISTANT: Hello, how can I aid you today?

USER: Please check a flight from Houston to Oakland under 500 fare.

ASSISTANT: Sure, please share me your airport codes?

USER: IAH and OAK are my airport codes.

ASSISTANT: May I know your planned journey dates?

USER: My planned journey dates are 09/20 and 09/22.

ASSISTANT: Do you need any halt in between the journey?

USER: Yes, I need one halt.

ASSISTANT: Please wait for a while.

USER: OK.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your journey dates.

USER: Ok, no problem. Thanks for your time.

ASSISTANT: Thank you for reaching us.