You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I know your name please to proceed further?

USER: Sure, my name is Donna Adams.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: No issues, thank you for your time.

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