You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Paul Garcia from Washington. I have to go to Denver next month for attending a business meeting there, can you please book a flight ticket for me on 08/19?

ASSISTANT: Sure, please share your source and destination airport codes.

USER: Thank you for accepting my request, I want to fly from DCA and destination airport is DEN.

ASSISTANT: Can I know when would you like to travel back?

USER: Yes, please confirm my return ticket also on 08/21.

ASSISTANT: AA airlines with flight number 1029 is available for you with single connection. Do you want me to proceed?

USER: Please proceed.

ASSISTANT: Your ticket is confirmed.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.