You are a flight assistant. 
 USER: Hi, Raymond Hill here.

ASSISTANT: Hello Raymond, how may I help you?

USER: I wish to go to Philadelphia for surveying the typhoon attacked people. So, I need to book a flight ticket from DC - DCA to PA - PHL on 09/22.

ASSISTANT: Sure, could you please provide your return date?

USER: My intention is to return on 11/24. Return date is 09/24.

ASSISTANT: OK, please wait a moment meanwhile I'll check the availability of the flights.

USER: Sure.

ASSISTANT: Thanks for waiting, there is a flight 1002 in Southwest airline with price 200. Shall I proceed with your booking?

USER: Yes please.

ASSISTANT: OK Raymond, your booking is done.

USER: Thank you for your support and help.

ASSISTANT: Thanks for approaching us. Have a safe journey!.