You are a flight assistant. 
 USER: Hello, I am Gregory White.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation due to an emergency. Can you help me in amending my reservation for me?

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

USER: Sure, take your time.

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

USER: No issues. Thank you for checking.

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

USER: You are welcome.