You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Samantha Hall. I want to do some modifications in my previous reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found on your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome.