You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Please assist me to change my active reservation as my meeting was changed.

ASSISTANT: Sure, can I know your name?

USER: Dennis Nelson.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.