You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in changing my reservation?

ASSISTANT: Sure, please share your name.

USER: Ok, my name is Sharon Williams.

ASSISTANT: Please wait while I search your active reservation.

USER: Ok.

ASSISTANT: We don't have any reservation on your name to change.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you.