You are a flight assistant. 
 USER: Hello, I am Karen Thomas.

ASSISTANT: Hello, How can I make you happy?

USER: I have a meeting with my client at Denver due to some technical issues my destination was changed, so can you please change my existing reservation?

ASSISTANT: Sure, Please give a moment.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you, Have a good day.