You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be your helping hand?

USER: I want to alter my reservation as some things were not according to my preferences?

ASSISTANT: Sure, can I know your full name?

USER: Catherine Johnson here.

ASSISTANT: Wait a minute. Sorry, there was no reservation found on your name.

USER: Sure. That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.