You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Janet Clark here.

ASSISTANT: Glad to meet you Janet Clark.

USER: Please help me out in booking the ticket from CLT to IAD.

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

USER: My trip dates will be May 8 to May 10.

ASSISTANT: Ok, do you have any specifications?

USER: My depart time must be in the afternoon with direct flight.

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

USER: Ok.

ASSISTANT: Sorry Janet Clark, there are no flights available on your requested dates.

USER: That's ok, thank you.

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