You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can i help you today?

USER: I am Gregory Phillips. I need to amend my reservation, can you help me out please?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Welcome, have a nice day.