You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: Samuel Martin here.

ASSISTANT: Please allow me a minute.

USER: Ok.

ASSISTANT: Samuel Martin, 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, Thanks for the information.

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