You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi.

USER: I am Donald Brown.

ASSISTANT: How can I help you?

USER: I need to fly Charlotte, could you please help me in booking my flight ticket from DCA to CLT?

ASSISTANT: Sure, may I know your travelling dates?

USER: My planned trip dates are 09/26 and 09/28.

ASSISTANT: Do you have any preference to make your journey comfortable?

USER: I need a halt in my journey. And my fare is 200.

ASSISTANT: Sure, let me check available flight for you. It may take a while.

USER: Ok.

ASSISTANT: We have a Delta airline flight number 1014 and the fare is 100. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.