You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am George Perez and I want to change my reservation, as my holidays are postponed. Would you help me in this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to say that no reservation was found in our database on your name.

USER: No problem. Thank you for your service.

ASSISTANT: Thanks for your presence, have a great day.