You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Brenda Robinson, I would like to change my recent reservation, can you help me?

ASSISTANT: Sure, I am here to help you. Hold on for a moment please.

USER: Thank you. Sure.

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

USER: That's fine, thanks for your information and great service.

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