You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Can you please help me in booking a flight ticket from IAD to CLT?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My travel dates are Sept 11th and Sept 13th.

ASSISTANT: Ok, do you have any specifications?

USER: I am looking for a stopover.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure.

ASSISTANT: May I know your name please?

USER: Margaret Hall.

ASSISTANT: Sorry Margaret Hall, there are no flights available on your requested dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.