You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I oblige you today?

USER: Due to some urgent office meeting, I am planning to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, can I know your good name?

USER: Myself Donald Clark.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no active reservation found with the given name.

USER: Not a big deal, anyhow thank you very much for checking the reservation status.

ASSISTANT: Thank you.