You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to do some modifications in my existing reservation, can you help me in that?

ASSISTANT: Sure, I am here to help you. May I know your name to check with the status?

USER: Sure, myself Robert Jackson.

ASSISTANT: Robert Jackson, regret to inform that there is no active reservation found under your name to amend.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching our agency.