You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Richard Martinez.

ASSISTANT: How can I help you now?

USER: Can you help me in searching a flight on 04/15 and 04/17?

ASSISTANT: Ok, may I know the takeoff and landing airport code of your journey?

USER: My preferable airport codes are MCO and EWR.

ASSISTANT: Please wait for a while.

USER: Please search a flight with 200 price limit.

ASSISTANT: Thank you for waiting, there is a flight 1022 in JetBlue airline has the price 300.

USER: Do not proceed with booking.

ASSISTANT: Ok.

USER: My price is only 200.

ASSISTANT: Sorry for the inconvenience, there is no flight with your price 200.

USER: Ok, thank you for your help.

ASSISTANT: You are welcome, have a nice day.