You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Nancy Williams. I want to book a flight ticket from CLT to EWR. Could you help me in booking?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable departure and return dates of travelling?

USER: My travelling dates are from April 11 to April 13.

ASSISTANT: Do you have any other specifications?

USER: I need a halt.

ASSISTANT: Please wait a moment to check the flights on your route.

USER: Ok.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.