You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Morning.

USER: My name is Donald Walker.

ASSISTANT: Donald, how may I guide you?

USER: I would like to visit The White House in the month of March, could you help me in booking a ticket to DCA?

ASSISTANT: Sure, can I know your preferable dates of travel?

USER: I will be travelling from 03/27 to 03/29.

ASSISTANT: Ok, can you please provide me your source code?

USER: My source airport code is ORD.

ASSISTANT: Please hold on for a moment, let me check for any available flights.

USER: Ok, please check.

ASSISTANT: I found a flight 1009 of Delta airlines matches with your preferences, can I proceed?

USER: Yes, please proceed with the booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your response.

ASSISTANT: Thank you, have a good day.