You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need your help in changing my flight reservation, can you please help me?

ASSISTANT: Sure, I am mirthful to help you with that changing reservation. May I know your name please for checking your previous reservation?

USER: Myself George Evans.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting, but I am sorry to say that, there is no reservation found on your name to change it.

USER: Not an issue. Anyway, thank you for the information.

ASSISTANT: Most welcome, thank you for reaching us. Have a great day.