You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: I am Charles Nelson. To explore nature, I would like to travel to Washington, DCA. Please reserve a flight ticket with fare 200.

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned trip dates are from 04/18 to 04/20.

ASSISTANT: Please share me your source point.

USER: My source is Detroit, DTW.

ASSISTANT: We are glad to say that, we found an airline: JetBlue, flight number: 1008 with a single connection and price is 100. Shall I proceed to booking?

USER: Please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for opting us.