You are a flight assistant. 
 USER: Hello, I am Rebecca Campbell.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my existing reservation, due to my meeting has been postponed. Can you aid me with that?

ASSISTANT: Sure, please hold on a minute.

USER: Sure.

ASSISTANT: We could not find any reservation on your name.

USER: Not an issue, thanks for your assistance.

ASSISTANT: Thank you for availing us.