You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Patrick Evans.

ASSISTANT: How can I assist you?

USER: I have a business meeting in Washington, can you help me for booking a flight ticket from DCA to IAD?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are Aug 11 and Aug 13.

ASSISTANT: Do you have any preferences?

USER: I need a single connecting flight.

ASSISTANT: Ok, Flight-1019 is available in Delta airlines with single connection and the flight fare is 100. Can I proceed with the booking?

USER: Ok, please proceed for booking.

ASSISTANT: Your booking is confirmed and have a safe journey.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.