You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Could you amend my existing reservation?

ASSISTANT: Sure, I am here to help you with that. May I know your good name?

USER: Ronald Martinez here.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found your name in our database.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.