You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I already have an reservation to attend at my meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you help me?

ASSISTANT: May I know your name?

USER: Gary Jones here.

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

USER: No problem, Thank you.

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