You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: My name is Alexander Brown and I would like to change my reservation.

ASSISTANT: Sure, I will help you with it. Please allow me a minute.

USER: Sure.

ASSISTANT: Alexander Brown, I am really sorry to inform you that there is no reservation found on your name to make the changes as per your request.

USER: No issue, thank you for your time.

ASSISTANT: Thank you for reaching us. Have a great time.