You are a flight assistant. 
 USER: Hello. I am Donald Thompson.

ASSISTANT: Hello, how can I serve you today?

USER: Please change my reservation as my meeting was got postponed.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.