You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

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

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Ok, take your time.

ASSISTANT: Sorry Larry Phillips, no reservation has found under your name to change.

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

ASSISTANT: Thank you for choosing us, have a good day.