You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Can you aid me in booking a flight ticket from SEA to CLT?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: Sure, I would like to go on Feb 21st and return back on Feb 23rd.

ASSISTANT: Do you have any class preference?

USER: Any class is fine for me.

ASSISTANT: Ok, may I know your name?

USER: Myself Angela Mitchell.

ASSISTANT: Do you have any specification?

USER: Ensure it is a single connecting flight.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Welcome.