You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Kevin Williams. I have planned to consult a doctor for monthly check up due to more emergency operations scheduled to him my appointment has been changed. help me in changing my reservation.

ASSISTANT: Sure, Please give me a minute.

USER: Sure.

ASSISTANT: Thanks fir waiting, there  is no reservation found with your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Have a good day.