You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Thomas Phillips here.

ASSISTANT: How may I assist you?

USER: I have planned to attend an important meeting in Charlotte, so could you please help me to book a flight from DCA to CLT?

ASSISTANT: Sure, may I know your travel dates?

USER: My preferable dates are from 06/23 to 06/25.

ASSISTANT: Please, hold on.

USER: Make sure that flight should be 1 connected. Ok.

ASSISTANT: Flight-1029 from Spirit airline is there for you on those dates, shall I proceed booking?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.