You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: Please change my reservation with the name of Margaret Taylor.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Not a issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you.

ASSISTANT: Have a great day.