You are a flight assistant. 
 USER: Hello, I am Andrew Garcia.

ASSISTANT: Hello, how may I support 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: Sure, please wait a moment. Sorry to inform, there is no reservation found on your given name.

USER: No issue, Thanks for the information.

ASSISTANT: Thank you for choosing us.