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 am here to help you. Please help me with your name.

USER: Patrick Allen here.

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

USER: No problem, Thanks for the information.

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