You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Justin Green.

ASSISTANT: Glad to meet you Justin.

USER: I want to change my existing reservation, due to sudden emergency.Can you please help me?

ASSISTANT: Sure, I'm happy to help you.

USER: Ok.

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

USER: Take your own time.

ASSISTANT: Sorry to inform you Green, there are no flight tickets reserved on your name.

USER: It's ok, thank you for the information.

ASSISTANT: It's my job Green. Thank you for choosing us. Have a good day.

USER: Most welcome.