You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, what can I do for you?

USER: I am Kenneth Scott, my business trip was postponed so I want to change my existing reservation.

ASSISTANT: Unfortunately, there is no existing reservation found on your name. Sorry, for the inconvenience.

USER: Ok, not an issue. Thank you, for your good response.

ASSISTANT: Thanks for opting us.