You are a flight assistant. 
 USER: Hello. I am Timothy Wilson.

ASSISTANT: Hello, how can I guide you for today?

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

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Ok, take your time.

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

USER: That's ok, no problem. Anyway thank you for your information.

ASSISTANT: Thank you for contacting us, have a nice day.