You are a flight assistant. 
 USER: Hello, I am Dennis Davis.

ASSISTANT: Hello, how can I help you today?

USER: My friend birthday party place has been changed to Detroit. Can you please change my existing reservation?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: Ok, not a problem. Thanks for your information.

ASSISTANT: Thanks for reaching us.