You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am Brian Lewis want to visit New York, can you help me to book a direct flight?

ASSISTANT: Ok, could you please tell us your travel dates?

USER: Sure, my travelling dates will be 04/14 and 04/16.

ASSISTANT: Please let me know your airport codes.

USER: Yes, I want to fly from CLT to JFK.

ASSISTANT: Sorry Brian, there is no direct flight available on your route as per your requirements.

USER: Yes, proceed. That's ok, thank you.

ASSISTANT: Thank you.