You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, please wait for a moment.

USER: Ok, I'll be online.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Joseph Davis.

ASSISTANT: I have found a reservation on your name, can you please share your source and destination airport codes? May I know your travelling dates please.

USER: Sure, my travel dates are 07/23 and 07/25. My source and destination airport codes are AUS and IAH.

ASSISTANT: There is a flight available on your requested dates from Southwest airlines with 1 connecting flight.Shall I confirm your booking?

USER: I need a direct flight, please search for it.

ASSISTANT: Sorry, there is no flight available for your request.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: You are most welcome.