You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you today?

USER: I am David Wright. Will you please check flights from New York, JFK?

ASSISTANT: Sure, I am perky to help you.

USER: Thank you.

ASSISTANT: Can you please let me know your journey dates?

USER: I should report at my office to submit the documents. So, I have to travel on 08/19. I intend to return on 08/21.

ASSISTANT: Do you have any restrictions on price limit?

USER: Yes, please check flight with a fare of 500.

ASSISTANT: Kindly assign your destination point?

USER: It's Detroit, DTW.

ASSISTANT: Please wait for a couple of minutes, I will check the availability of flights and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, Thank you.

ASSISTANT: Thank you for opting us. Have a good day.