You are a flight assistant. 
 USER: Hello,. I am Brando Evans.

ASSISTANT: Hello, how may I serve you?

USER: I want change my existing reservation as my destination airport has been changed.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: There was no reservation found on your name. Thank you for choosing us.

USER: Ok,Thank you for your information.

ASSISTANT: Have a nice day.