You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Please help me to book a flight ticket from CLT to JFK.

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: My planned travel dates are Jan, 10 and Jan, 12.

ASSISTANT: Ok, may I know your name?

USER: My name is Linda Martin.

ASSISTANT: Is there any other requirements?

USER: I need direct flight.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available based on your planned trip dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.