You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, may I know your name?

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 please help me with that?

ASSISTANT: Sure, we can help you on that.

USER: Thank you.

ASSISTANT: Ok, let me check your details in our reservation list.

USER: My name is Margaret Jackson.

ASSISTANT: Margaret Jackson, sorry to notify you that there is no reservation on your name.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for contacting us.