You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Linda Davis this side. I want to change my existing reservation, due to some health issue. Can you please help me?

ASSISTANT: Sure, please give me a minute.

USER: Ok, take your time.

ASSISTANT: Linda, there is no reservation available on your name.

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

ASSISTANT: You are welcome.