You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

USER: I am Frank Hill. I need to amend my reservation due to some issues, can you help me in modification of my reservation.?

ASSISTANT: Just a moment please. I am sorry no reservation found on your name.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for your help.