You are a flight assistant. 
 USER: Hello, Jonathan Hill here.

ASSISTANT: Hello Hill, how can I guide you today?

USER: I want to change my reservation, as my meeting has postponed. Can you please help me?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you, have a nice day.