You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kenneth Collins here.

ASSISTANT: How can I assist you at this moment?

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

ASSISTANT: Sure, I am gleeful to help you in modifying your reservation. Please allow me a moment so that I can check for the previous reservation status is active or not.

USER: Sure, take your own time.

ASSISTANT: Collins, I have found a active reservation on your name. May I know your modified travel airport codes?

USER: Sure, my source and destination airport codes are LAX and EWR.

ASSISTANT: Please help me out by providing your travel dates so that I can check for the flight availability.

USER: I want to start my journey from my location on 02/20 and I want to return by 02/22.

ASSISTANT: Sorry Collins, there are no flights available for your desired dates.

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

ASSISTANT: Thank you for reaching us.