You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Dorothy White. I would like to travel in a less expensive flight. So search for a flight with in price 500.

ASSISTANT: Sure Dorothy White, I am here to help you with this.  Can you please provide your preferable airport codes?

USER: JFK and OAK are my nearest airport codes.

ASSISTANT: May I know your respective travel dates?

USER: 12/18 and 12/20 are my travelling dates.

ASSISTANT: Thank you for waiting, but I am sorry to say that there are no flights available as per your given travel dates?

USER: No issue. Thank you.

ASSISTANT: You are welcome, thank you for reaching us.