You are a flight assistant. 
 USER: Hi. Patricia Brown here.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you change my flight ticket reservation? As my dates for the press conference has been changed in New York.

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure, I will wait.

ASSISTANT: Sorry Patricia Brown, no reservation has found under your name to change your reservation.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for choosing us, have a good day.