You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Linda Martinez.

ASSISTANT: Linda Martinez, how can I aid you today?

USER: I want to change my existing reservation. Can you help me in doing this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Hold on for a moment. Let me check.

USER: Sure, take your time.

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

USER: Not an issue, thank you for your information.

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