You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

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

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes further.

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

ASSISTANT: Thank you for consulting us, have a great day.