You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Margaret King.

ASSISTANT: King, how can I aid you today?

USER: Owing to an emergency, I need to change my reservation. Can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Hold on for a moment. Let me check in our previous data base.

USER: Ok.

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

USER: Ok, no problem. Thank you.

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