You are a flight assistant. 
 USER: Hi, I am Helen King.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: Ok. Thanks for your response.

ASSISTANT: Thanks for reaching us, have a good day.