You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: Please change my reservation, which is reserved earlier on my name Charles Adams.

ASSISTANT: Ok. Please hold on.

USER: Ok.

ASSISTANT: No reservation found on you name.

USER: Ok, no problem.

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

USER: Thanks for the effort.