You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can aid you today?

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

ASSISTANT: Sure, I will aid you with that. May I know your name for further process?

USER: I am Mark Parker.

ASSISTANT: There is no previous reservation available under your name.

USER: No issue, Thanks for the information.

ASSISTANT: Thank you for reaching us.