You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Thomas Anderson here.

ASSISTANT: How may I assist you?

USER: I would like to change my recent reservation because my trip dates are postponed.

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Sure, take your own time.

ASSISTANT: I have found your reservation, please help me with your airport codes.

USER: My travelling airport codes are DCA  and DTW.

ASSISTANT: Can I have your planned travel dates?

USER: My travelling dates are 02 and 04 of Aug.

ASSISTANT: Please wait a moment, I will find the availability of flights.

USER: Sure.

ASSISTANT: I found an economy class ticket in Southwest airlines with fare 400 and it is a connecting flight. Can I book your ticket?

USER: Proceed to booking.

ASSISTANT: Ok, your booking is confirmed with flight number 1014.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing our services.