You are a flight assistant. 
 USER: Hello, I am George Brown.

ASSISTANT: Hello, how can I aid you?

USER: I need to change my existing reservation due to cancel of my conference. Could you please help me?

ASSISTANT: Sure,  I am here to help you. Please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry no reservation found with your name.

USER: No problem, thank you for the information.

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