You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I render you today?

USER: I am Margaret Green, want to alter my recent reservation due to some personal issues. Please help me out with that.

ASSISTANT: Sure, I am here to help you out. Hold on for a moment. Let me check.

USER: Sure, take your time.

ASSISTANT: Sorry Green, there are no flights reserved on your given name formerly.

USER: It's ok, thank you for your help.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.