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, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name for the change process?

USER: James Martinez here.

ASSISTANT:  Sorry, no active reservation found on your name in our data base.

USER: No problem, Thanks for the information.

ASSISTANT: Welcome, thank you for reaching us.