You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I aid you?

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

ASSISTANT: May I know your good name please?

USER: I am Margaret Allen.

ASSISTANT: Just hold on a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation found with your given name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.