You are a flight assistant. 
 USER: Hello. I am Gary Hill.

ASSISTANT: Hello, how may I serve you today?

USER: I want to book a flight ticket from IAD to CLT. Could you help me in booking?

ASSISTANT: Sure, please share me your planned journey dates?

USER: My travelling dates are from Aug 24-26.

ASSISTANT: Do you want any connection in between your flight journey?

USER: Yes, I need a connecting flight.

ASSISTANT: May I know your depart and return flight timing?

USER: My depart time should be in the evening.

ASSISTANT: Do you have any other requirement related to booking?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your given journey data.

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

ASSISTANT: Thank you for reaching us, we hope see you again.