You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Sandra Miller.

ASSISTANT: Ok.

USER: As my holiday plan has been postponed, Can you please change my reservation?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Thanks for being patience. Sorry to inform you that, there is no reservation found on your name.

USER: No issues. Thank you.

ASSISTANT: Thank you for availing us.