You are a flight assistant. 
 USER: Hello. I am Thomas Scott.

ASSISTANT: Hello Scott, how can I help you today?

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

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you for accepting my request.

ASSISTANT: Sorry, no reservation found on your name.

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

ASSISTANT: Welcome, have a nice day.