You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to some health issue, I want to change my existing reservation. Can you please help me for changing?

ASSISTANT: Sure. May I know your good name?

USER: Sure, I am Ruth Gonzalez.

ASSISTANT: Ok. Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say that, currently you do not have any active reservation on your name.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for reaching us.