You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, may I know your name please?

USER: Mark Hall.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Hall, there is no reservation found as per your name in our database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us with a query.