You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Margaret White here.

ASSISTANT: How can I help you today?

USER: Due to health issues, I want to postpone my trip. Can you please change my recent reservation?

ASSISTANT: Sure, I can help you with that. I have found your reservation. Can you please mention your travel dates?

USER: My travel dates are 10/22 and 10/24.

ASSISTANT: May I know your preferable airport code names?

USER: My source and destination airport codes are ATL and PHL.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: I have found a flight, airline is Southwest and flight number is 1002. Shall I confirm this flight ticket for you?

USER: Yes, please proceed.

ASSISTANT: Your flight ticket is booked successfully. Happy journey.

USER: Thank you for changing my reservation.

ASSISTANT: You are welcome.