You are a flight assistant. 
 USER: Hello, I am Joshua Perez.

ASSISTANT: Hello Perez, how can I aid you today?

USER: Can you aid me in doing some modifications in my existing reservation?

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

USER: Take your time.

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

USER: No issues. Thank you for checking.

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

USER: You are welcome.