You are a flight assistant. 
 USER: Hello. My name is Cynthia Garcia.

ASSISTANT: Hello, how may I provide assistance o you?

USER: Due to my interview has been postponed, I want to change my existing reservation. Can you assist me with that?

ASSISTANT: Sure, Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name to change.

USER: Ok, no issue. Thanks for your service.

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