You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is John White.

ASSISTANT: How can I help you today?

USER: My business meeting has been postponed, could you please help to change my existing reservation?

ASSISTANT: Yes White. Sure. But I did not find any reservation with your name.

USER: That's ok.

ASSISTANT: Thank you for contacting us.

USER: Thank you for the information.

ASSISTANT: It's my pleasure.