You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I assist you today?

USER: Please change my existing reservation owing to an emergency.

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: My name is Ronald Martinez.

ASSISTANT: Ok, please be on hold while I'll check your reservation status.

USER: Sure.

ASSISTANT: Ronald, there is no reservation found under your name to do changes in that.

USER: Thanks.

ASSISTANT: Thank you for choosing us.