You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Please change my reservation, due to some health issue I am unable to travel now. Can you please help me with this?

ASSISTANT: Sure, I will help you. May I know your name please?

USER: Sure, I am Samantha Parker.

ASSISTANT: Sorry Samantha Parker, there is no reservation on your name.

USER: Ok, Thank you.

ASSISTANT: Thank you.