You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me to change my reservation? As I have some important work at my office.

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Sure.

ASSISTANT: May I know your name?

USER: My name is Joshua Carter.

ASSISTANT: Sorry Carter, there is no reservation on your name in our data base.

USER: Not an issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.