You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Jacob White.

ASSISTANT: How can I assist you?

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

ASSISTANT: Ok, please wait.

USER: Ok, take your time.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: That's ok, thank you for your information.