You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I need to change my boarding point of my existing reservation as I need to go to other place first and I will start from there. Can you help me out with this?

ASSISTANT: Sure, I will help you. Please help me with your name to check for your reservation details.

USER: Steven Williams.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Steven Williams, I am really sorry to inform you that there is no booking done on your name.

USER: No problem, thank you.

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