You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I have already booked a flight ticket to visit Charlotte to enjoy my trip but due to some issues it has been postponed. Can you please help me with changing my reservation?

ASSISTANT: Sure, we are here to help you. May I know your name for the changing process?

USER: Sure, I am Ryan Jackson.

ASSISTANT: Sorry, we couldn't find a reservation on your name to change.

USER: No worries, thank you for the information.

ASSISTANT: Welcome, thank you for reaching us.